John and Jennifer's offspring can have either type B (inherited from John) or type O (inherited from either parent) blood. Types A and AB are not possible as neither parent carries the A antigen.
Explanation:The topic of this question involves Blood Types and inheritance. In humans, the blood types are determined by the ABO blood group system. John's blood type is B, which is determined by the presence of B antigens on the surface of the erythrocytes. Jennifer has an O blood type, which means that she has neither A nor B antigens. The possible blood types of their offspring are determined by the alleles each parent contributes.
John's possible genotypes could be BB (if he inherited B genes from both parents) or BO (if he inherited an O gene from his mother). As Jennifer has blood type O, her genotype will be OO.
The possible genotypes of their offspring would therefore be BO (from a B gene from John and an O gene from Jennifer) or OO (from an O gene from both parents). Translated into blood types, their children could have either blood type B (from the BO genotype) or O (from the OO genotype), but not A or AB, as neither parent carries the A gene.
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What describes the diet of a saprotroph?
Dead plant matter
Bones and feathers
Animals and fungus
Plants and fungus
This type of life form seems to feed on decaying organic matter. Hope this helped!
The diet of a saprotroph organism includes bones and feathers.
A decomposer (also known as detritivore) is any organism that breaks down and eats dead organic material.
On the other hand, a saprotroph is an organism that eats the remaining organic material other decomposers cannot (e.g., bones, fur, etc).
Saprotrophic organisms include bacteria (e.g., E. coli, Spirochaeta), fungi, etc.
In conclusion, the diet of a saprotroph organism includes bones and feathers.
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Both Darwin and Lamarck proposed mechanisms by which species might evolve. Although Darwin first published his ideas in the mid-1800s, most scientists continued to favor Lamarck's explanation until near the end of that century. What was the most likely cause of the eventual shift from Lamarck's hypothesis to that proposed by Darwin?
Answer:
More evidence accumulated supporting Darwin's ideas than could be found to support Lamarck's.
Explanation:
Answer:
Several evidences were found that supported the ideas defended by Darwin. As a result, Lamarck's ideas became obsolete.
Explanation:
Although we currently use Darwin's theories to explain the evolutionary processes of living beings, this has not always been the case. For a long time, Lamarck's theory of how living beings evolved was the theory accepted as correct.
Lamarck's theory is known as the "law of use and disuse". This law states that living beings have evolved because they have started to use a feature a lot, which has been developing more than the others. For example: In Lamarck's theory, giraffes had a large neck because, one day they had a small neck, but they stretched so far to reach the leaves of the trees that the neck developed, until it reached the height we know.
Although Darwin's theory of natural selection makes much more sense, it was only considered by scientists after much evidence about evolution was discovered. This evidence supported Darwin's theories, but made Lamarck's obsolete.
the aurora borealis caused by the
Answer:
Gaseous particles coming from the sun entering atmosphere through the poles, where Earth's magnetic field is the weakest.
The colors of the aurora borealis depends of the gas that is in the particles entering the atmosphere: oxygen will produce a pale yellowish-green, while nitrogen will produce blue or purplish-red, for example.
It's a phenomenon that can be seen near both poles... but of course it's much more accessible to watch in the Northern hemisphere.
Phosphorus is required for organisms to synthesize DNA and phospholipids. In an ecosystem, phosphorus is transferred into the soil by the weathering of rocks. Phosphorus is absorbed by plants, which are consumed by herbivores. Carnivores obtain phosphorus through the consumption of herbivores. Which is a process that transfers phosphorus between an abiotic system and a biotic system.
a , a plant absorbing phosphorus from the soil
b , weathering of rocks releases phosphorus into the soil
c , an herbivore consuming a plant
d , a carnivore consuming an herbivore
Answer:
a plant absorbing phosphorus from the soil
The transfer of phosphorus from abiotic to biotic organisms is the transfer of phosphorus from the soil to the plant. This phosphorus is required by living organisms for different cellular processes. Option a is correct.
What is a nutrient cycle in an ecosystem?In an ecosystem, the decomposers decompose dead animals and plants and release nutrients into the soil such as phosphorus, nitrogen, carbon, etc. These nutrients are present in the soil and consumed by plants in that ecosystem. The soil becomes fertile due to the availability of these nutrients. Plants are the producers in an ecosystem and, with the help of photosynthesis, make food.
Herbivores that feed on plants get phosphorus from plant sources, carnivores get it from herbivores, etc. Every nutrient, such as carbon, nitrogen, and sulfur, makes its way from soil to plant and then to animals in this manner.
Hence, because the biotic and abiotic connection is plants from the soil, option a is the correct answer.
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What causes a branch in a cladogram
A branch in a cladogram represents the evolutionary divergence or splitting of a common ancestor into two or more different lineages. It indicates a point in evolutionary history where a group of organisms, represented by the common ancestor, gave rise to separate descendant lineages.
The branching pattern is determined based on the analysis of various characteristics or traits shared among different organisms. These traits can include anatomical features, physiological characteristics, genetic information, or even behavioral patterns. By comparing and analyzing these traits, scientists can construct cladograms or phylogenetic trees to depict the evolutionary relationships and the branching patterns of organisms.
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Cheryl classifies an organism based on the broadest taxonomic classification. In what group might she place it?
A. Protista
B. Animalia
C. Eukarya
D. Fungi
Answer:
C. Eukarya
Explanation:
The phylogenetic tree is based around three branches, eukrya, archaea, and bacteria. In order to place an organism in the broadest taxonomic classification, it will go under eukarya in this case, as it is the only one from the three basic ones from the choices provided. Eukarya is the branch where we have multi-cellular organisms, and it is the one that has given rise to the best known organisms on the planet, the largest ones, most attractive etc. The animals and plants fall into the category of eukarya and are its most marking members, thus the humans are part of it as well.
describe the difference between bioprospecting and biopiracy
Difference between bioprospection and biopiracy
Bioprospection is an attempt to search for new chemical contents in living things, both microorganisms, animals, and plants that have the potential as a drug or other economic benefits while Biopiracy is the theft of biological resources for the benefit of certain parties and detrimental to other parties
Further explanation
From the answers above it can be concluded that bioprospection and biopiracy are the opposite.
Bioprospection can be said to have two different sides. On one hand, the many bioprospecting activities provide opportunities to make human life better. While on the other hand, this activity poses a threat to biodiversity because it provides opportunities for biopiracy.
Biopiracy is often done by parties with advanced technological developments, but do not have enough biological resources for their progress. So developing countries that are rich in biological resources become their main goal. The government and the community may be familiar with the main goals of the developed countries but often cannot hamper the pace of biopiracy.
The solution is:
By making national laws and regulations and international laws. To make bioprospection truly prosperous without worrying about the occurrence of biopiracy, in addition to the drafting of the law, many things must be addressed and considered. Because bioprospection activities should also be subject to various international and national regulations to prevent the occurrence of biopiracy practices.
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Details
Class: Middle School
Subject: Biology
Keywords: Biopiracy, Bioprospection, Bioprospection Vs Biopiracy.
Answer:
Both Bioprospecting and Biopiracy are contradictory to each other.
Bioprospecting involves research for potential usage of any animal or plant species for economic purposes such as usage in drugs, cosmetics, or any other industry. Biopiracy is the illegal or unlawful usage of purposeful plants or other species which prevents its general usage to certain parties providing commercial benefits to others.Explanation:
Bioprospecting :Many plants and animals have medical usage that could cure many diseases and other conditions, apart from the medical usage these species can also be beneficial for other sectors such as agriculture, cosmetics, and others. Bioprospecting is the legal and well-organized search for such species which can yield benefits to companies and governments.Bioprospecting has many benefits such as it promotes research and development, it helps in deep research of many species of plants and animals which in turn provides medical and economic benefits.Biopiracy:The ill use of intellectual property rights and exploitation of indigenous natural resources claiming unauthorized patents and GIs. Many countries and companies exploit vulnerable countries and their people by claiming authority over their products through finding loopholes in-laws is called biopiracy. Some examples of biopiracy include patents of US private companies over Turmeric and neem which were originally produced and used in India giving them an economic benefit over products which includes the usage of such plants.For more information:
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Which human reproductive organs produce sperm? Which produce eggs?
Answer:
The testes produce the sperm, and the ovaries produce the eggs.
Explanation:
Sperm and egg cells are both called gametes. When an egg and a sperm join, it is called fertilization. This is the correct answer to this question.
Hope this helps!!!
Kyle.
Answer:
testes
ovaries
Explanation:
Sperms are produced by the testes.
Eggs are produced by the ovaries.
what are agricultural practises
Answer:
Agricultural practices are collection of principles to apply for farm production processes to get better agricultural products.
Good agricultural practice is a certification system for agriculture, specifying procedures that must be implemented to create food for consumers or further processing that is safe and wholesome, using sustainable methods
Which attributes describe nonrenewable resources ?
Answer:
Exist in fixed amounts
Explanation:
This means that this item is not something that can be created again, once you use it you use it and it's gone.
Answer:
Non-renewable resources are used faster than they can be replaced.
Explanation:
Even when it is possible to replace them, it takes so many time to do.
For example, fossil fuel: it takes millions of years to replace it, once used.
What is the official term given to the harmful effects that a drug or chemical may have on an organism?
A. Toxicity
B. Harmful
C. Lethal
D. Baneful
Answer:
A. Toxicity
Explanation:
Toxicity is the ability of some chemical substance or medication to generate harmful effects on a living being, by coming into contact with it. Toxicology is the area of study that is dedicated to the toxicity of substances.
All substances have some degree of toxicity since any substance is capable of producing a toxic effect if a sufficient dose is administered. All substances are toxic; however, some are toxic to a greater degree compared to others.
The answer is toxicity
According to the graph, which biome extends across the largest temperature variation?
a. Temperate forest
b. Taiga
c. Grassland
d. Desert
That would be D. Desert :)
Answer:
Option- D
By analyzing the graph given we can see that there is much difference or variance in the whole data relating the temperature of the deserts. As, we can see that the value of the graph slightly changed over time and we can also experience it inside these regions comprised of deserts which has a very high temperature in most of the day while the same place becomes freezing then ever at night fall.identify the type of energy described in each sentence
Lipids to fat: Chemical, since ingestion is in process to make this change possible.
Hat: Gravitational, since gravity causes objects to pull toward each other, here it is the Earth and the hat.
Wave of water: Mechanical, since the movement of energy is visible and clearly touchable.
Burner to kettle: Thermal, since heat is involved.
Power plant: Nuclear, since splitting atoms is part of the process called nuclear fission.
Nerve: Electrical, since nerves function by sending electrical pulses.
Sun to plant: Radiant, since the sun's electromagnetic waves/radiation are being transferred.
The type of energy described is Chemical energy, Gravitational energy, Mechanical energy, Thermal energy, Nuclear energy, Electrical energy, and Radiant energy.
What is Energy?Energy is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light.
Lipids to fat: Chemical energy, since ingestion is in the process to make this change possible.Hat: Gravitational energy, since gravity causes objects to pull toward each other, here it is the Earth and the hat.A wave of water: Mechanical energy, since the movement of energy is visible and clearly touchable.Burner to kettle: Thermal energy, since heat is involved.Power plant: Nuclear energy, since splitting atoms is part of the process called nuclear fission.Nerve: Electrical energy, since nerves function by sending electrical pulses.Sun to plant: Radiant energy since the sun's electromagnetic waves/radiation are being transferred.To learn more about energy, refer:
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Recall the three layers of muscles in the wall of the heart. Which lists these muscles in order from closest to the blood inside the chamber to farthest from the blood?
Answer:
The cardiac wall contains three layers: epicardium, myocardium and endocardium.
Explanation:
The epicardium, the outermost layer of the heart, also has a large amount of adipose tissue. It is the same as the visceral layer of the serous pericardium.
The myocardium, located below the epicardium, is the cardiac muscle tissue as such, responsible for pumping the blood through the circulatory system through contraction.
The endocardium is the membrane that covers the inside of the heart. This membrane surrounds the inside of blood vessels, transporting blood through a continuous tunnel of endothelial cells throughout the cardiovascular system.
Answer:
A. epicardium, myocardium and endocardium
Explanation:
EDGE 2020
distantly related organisms may be similar if they live in ?
Distantly related organisms may be similar if they live in Similar environments
Which of the following would be a body response when stepping outside without a coat on a snowy day?
On a snowy day, without a coat, our body responds in three ways. It gives goosebumps to trap heat, induce shivering to generate heat, and constricts blood vessels to preserve body heat.
Explanation:When stepping outside on a snowy day without a coat, our bodies respond to the freezing temperatures in several ways. First, you'll likely experience goosebumps, a reflex action aimed at raising body hair to trap warm air closer to the skin. Second, you might also begin to shiver, a rapid contraction and expansion of muscles to generate heat in your body. Third, blood vessels near the skin will constrict (vasoconstriction) to preserve body heat, diverting it towards vital organs.
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The body response to cold when stepping outside without a coat includes narrowing and contracting blood vessels in the skin (vasoconstriction) to reduce heat loss and maintain core body temperature.
When stepping outside without a coat on a snowy day, the body responds by initiating thermoregulation to preserve heat. The correct response is A. Blood vessels in the skin narrow and contract, a process known as vasoconstriction. This action reduces the flow of blood to the skin's surface, thereby minimizing heat loss. In contrast, during activities that increase body temperature such as running or skiing, the body would dilate the dermal blood vessels and increase sweat secretion to prevent overheating, but this is not the case in cold environments. Instead, the body conserves heat to maintain core temperature.
The complete question is:
Which of the following would be a body response when stepping outside without a coat on a snowy day?
A. Blood vessels in the skin narrow and contract.
B. More liquid is transported by the body to the skin for insulation.
C. Sebaceous glands secrete more sebum.
D. Blood vessels in the skin expand
What are the weather events related to a warm front?
slow and steady precipitation occurring at the front with warmer temperatures after the front passes
These glands are also known as eccrine glands and help maintain body temperature. Sebaceous
sweat
chloride
dermal
The eccrine glands, also known as dermal sweat glands, play a crucial role in maintaining body temperature. They produce sweat, and its evaporation from the skin's surface cools the body down, contributing to thermoregulation.
Explanation:The glands referred to as eccrine glands are also known as dermal sweat glands. These glands are predominantly located throughout the human skin, and they play an essential role in maintaining body temperature. The primary function of these glands is to produce sweat, which, when it evaporates off of the skin surface, helps to cool the body down. This process is an essential part of thermoregulation, the body's way of maintaining a stable internal temperature despite varying external conditions.
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The glands in mention are the sweat glands or eccrine glands. They play a crucial role in temperature regulation by releasing sweat when the body overheats. They are found all over the body and are most abundant on the forehead, palms, and soles.
Explanation:The glands referred to in your question are sweat glands. Sweat glands, also called eccrine glands, are crucial in helping the body maintain its temperature. When your body heats up, these glands release sweat which, upon evaporation, cools down the body. Eccrine glands are different from sebaceous glands in that the latter produce an oily secretion to help keep the skin lubricated. They are spread all over the body, but are most dense on the forehead, the palms of the hand, and the soles of the feet.
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which body system produces movement by contracting and relaxing
Answer:
The Muscular System
Explanation:
Answer:
Muscular system
Explanation:
The muscular system is made up of different cells that is referred to as muscle fibers, which their function is based on contraction and relaxation. The movement in our body is possible as result of contraction because their is an attachment of the muscle to the body internal organs. This movement as result of contraction aid the body joint stabilit( this as a result of extension of tendons over the body joints), posture(responsible fort us to stand and sit).
The skeletal muscles in our body are in active service to make sure thebody is held in stationary positions.they provide the free movement that allows the body to run and walk, in addition they provide subtle eye movement and even facial expressions.
Which of the following is true of multicellular organisms?
they often have specialized cells
they contain DNA
they are made on one or more cells
all are true of multicellular organisms
Multi cellular organisms do often have specialized cells.
-these specialized cells come together and work as a team to carry out functions
Multi cellular organisms do contain DNA
-DNA is very important to multi cellular organisms. Cell differentation resulted in specialized cells that could carry out different functions
Multi cellular organisms are made of one or more cells
-like the name suggests they are multi cellular meaning more than one cell haha
Answer- They are all true of multi cellular organisms
In essence multicellular organisms do contain DNA are composed of more than one cell and often have specialized cells. Each cell in these organisms carry out complex specific functions that contribute to the entire organism's operations.
Explanation:All of the given statements are indeed true of multicellular organisms. First off multicellular organisms, such as plants, animals and fungi contain DNA; which they use to pass on genetic information to offspring. DNA serves as the blueprint for the construction and functioning of every cell.
Secondly, multicellular organisms are made up of more than one cell. These organisms are composed of numerous cells that work together to perform complex functions. This ties into the third point, that multicellular organisms often have specialized cells with unique functions. For instance in humans there are nerve cells for transmitting signals red blood cells for carrying oxygen, and so forth. These cells are specialized meaning they perform specific roles that contribute to the overall function of the organism.
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Drag each label to the correct location on the image
Identify the steps in the rainshadow process
Answer:
To identify the steps in the rain shadow process: drag "air cooling and condensing" to the block on the bottom right, then "warn moist air rising" to the block that is on top of this and finaly "rain shadow effect" to the left block.
Explanation:
Ok. To start a rain shadow is a region in the lee of mountains that receives less rainfall than the region windward of the mountains.
The process occurs this way
Prevailing winds carry air toward the mountain range. As the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. The windward side of a mountain range is moist and lush because of this precipitation. Once the air passes over the mountain range, it moves down the other side, warms, and dries out. This dry air produces a rain shadow. Land in a rain shadow is typically very dry.So, to identify the steps in the rain shadow process on the image:
a. Prevailing winds
b. Air cooling and condensing.
c. Warm, moist air rising.
d. Dry air
e. Rain shadow effect
The question asks the student to identify steps in the rainshadow process, which involves understanding how the interaction of mountains with moist air leads to precipitation on one side and dry conditions on the other.
Explanation:The student's question revolves around understanding the rainshadow process, a geographic and meteorological phenomenon. As a part of a learning activity, the student is likely asked to label different parts of a diagram, identifying each step in the process that leads to the formation of a rainshadow on the leeward side of a mountain range. This is how the process generally unfolds:
Moist air approaches the mountain range and is forced to rise.As the air rises, it cools and the moisture condenses, causing precipitation on the windward side of the mountain.The air, now dry, descends on the leeward side of the mountain.Due to the lack of moisture, the descending air creates arid conditions, forming a rainshadow desert.This sequence is pivotal in understanding how geographical barriers can have a significant impact on local climates and ecosystems.
explain the cellular functions that occur when antibiotics attacks a bacteria cell
Answer:
Antibiotics target the cell wall, cell membrane, and the processes of protein and nucleic acids production in bacteria to rupture the cell..
Explanation:
Final answer:
Antibiotics target bacterial structures and macro-molecules, inhibiting cell wall synthesis, damaging cytoplasmic membranes, disrupting DNA synthesis, and causing oxidative damage, which lead to bacterial cell death. These actions are integral to combatting bacterial infections without harming human cells.
Explanation:
How Antibiotics Affect Bacterial Structures and Functions
Antibiotics are potent medicines designed to combat bacterial infections by targeting specific bacterial structures and macro-molecules. These targeted attacks can lead to the disruption of essential cellular functions, ultimately causing the bacteria to die. Here are four different ways antibiotics or disinfectants may affect bacterial cells:
Inhibition of Cell Wall Synthesis: Many antibiotics, like penicillin, target the bacterial cell wall, which is essential for maintaining the cell's shape and integrity. By inhibiting the synthesis of the cell wall, the antibiotics cause the bacteria to burst and die due to osmotic pressure.Alteration of the Cytoplasmic Membrane: Certain antibiotics affect the cytoplasmic membrane's integrity, leading to leakage of cellular contents and resulting in cell death.Inhibition of DNA Synthesis: Some antibiotics, like fluoroquinolones, target enzymes involved in DNA replication. By blocking DNA synthesis, these drugs prevent the bacteria from replicating and carrying out necessary genetic functions.Oxidative Damage: Recent research suggests that all antibiotics might induce oxidative damage as a common effect. This damage, when severe enough, leads to cell death. Enhancing this effect by blocking bacterial defense mechanisms against oxidative damage can significantly increase the efficacy of antibiotics.Understanding these mechanisms is crucial, particularly given the rise of antibiotic resistance. Designing new strategies that leverage our knowledge about bacterial cell function and antibiotic action is important for developing more effective treatments against resilient bacterial strains.
Which definition best describes polygenic traits?
A.
traits that are controlled by multiple genes
B.
traits that express both alleles of a gene pair
c.
traits that are carried on linked genes
D.
traits that affect several features
Reset
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The best definition which describes polygenic traits is :
B) traits that are controlled by multiple genes.
Polygenic traits basically mean the traits that are a result of multiple intertwined traits like for example skin colour.
When two people mate their traits get intertwined and the resultant trait of the baby is a result of the polygenic traits.
Answer:
A. traits that are controlled by multiple genes
Explanation:
Polygenic traits are controlled by more than one genes. An example of this on humans is height. Not one gene controls the height of a human, many traits contribute to the height of a human.
Rabbits and sheep both graze on shrubs, grasses, and other plants. The sharp rise in the population of rabbits in a region may result in a shortage of plants for sheep to graze upon. This relationship between sheep and rabbits is an example of _______.
Answer:
Competition
Explanation:
Answer:
competition
Explanation:
During competition there is an interaction between the species of plants and animals that compete for territory, food, or mating with the opposite sex and in which one of them is harmed.
One of these fights may be due to the consumption of some limited resource that both species need in order to survive, such as that of the shrubs in the example. This type of competition occurs all the time in all ecosystems.
When competition occurs between individuals of different species, it is called interspecific competition, and when it occurs between individuals of the same species it is called intraspecific competition.
It usually ends up surviving the most suitable species.
Convert 11.75 millimeters to meters. meters
Answer:
0.01175 meters
......
Answer:
0.01175
Explanation:
To convert millimeters to meters, we must divide the number of millimeters by 1000 because for one meter, there is one thousand millimeters
So, 11.75/1000= 0.01175
The lesser tubercle of the humerus is the distal skeletal attachment site for the
Answer:
It has an anterior and posterior face. The greater tubercle serves as attachment site for three of the rotator cuff muscles – supraspinatus, infraspinatus and teres minor – they attach to superior, middle and inferior facets respectively. The lesser tubercle is much smaller, and more medially located on the bone
Answer:
Explanation:
The lesser tubercle is smaller and more medially located on the bone. It only has an anterior surface. The lesser tubercle provides attachment for the last rotator cuff muscle which is the subscapularis. The intertubercular sulcus Separates the two tubercles.
what phenomenon is responsible for Hotspot volcanism
A. ridge push
B. pyroclastic flows
C. subduction
D. mantle plumes
Answer:
D. mantle plumes
Explanation:
The hotspot volcanism occurs because of mantle plumes. This type of volcanic activity can occur both in oceanic plates, or in continental plates. The mantle plumes are very powerful. They manage to penetrate through the crust without any particular problem, even if it is the the thickest part of the crust. This is why the hot spot volcanism is mostly found in the middle of the tectonic plates, or at least far away from the plate boundaries. The plates move above the mantle plumes, or rather the hotspot, and as they do they drag away with them the volcanoes that have been created. The volcanoes will lose their connection with the hotspot and they will stop being active, but the hotspot will create another, new volcano above, and the process continues. This type of volcanic activity can be seen on the Hawaii Islands, as well as the Yellowstone supervolcano.
Macy always thought there were only a few hair colors: blond, brown, and black. However, when she actually began looking around, she saw varying shades of these hair colors. What is a possible reason for so many different hair colors?
Answer: A possible reason for these haircolors is that you could get a mix of your 2 parents haircolors. Another possible reason is that people just simply tinted their hair.
Answer:
polygenic inheritance
Explanation:
Energy + 6CO2 + 6H2O → 6O2 + C6H12O6 This is the chemical reaction that occurs during photosynthesis; identify which of these is a product in this chemical reaction. A) water B) oxygen C) hydrogen D) carbon dioxide
Answer:
oxygen
Explanation:
the products of the reactions are 6O2 (oxygen) and C6H1206 (glucose)
Blood type in humans is an example of a trait that has multiple alleles. The alleles for type A blood and type B blood are codominant, and type O blood is recessive to both type A and type B. If a girl with type AB blood has a brother with type O blood and a sister with type B blood, which of the following genotypes could it be possible for their parents to have?
Given that the offspring have blood types AB, B, and O, it is possible for the parents to have genotypes of IAi and IBi. This demonstrates the facets of multiple alleles and codominance in the determination of blood types in humans.
Explanation:The possible genotypes for the parents are IAi and IBi. The girl with blood type AB must inherit an A allele from one parent and a B allele from the other, making her genotype IAIB. The sister with blood type B could have inherited an B allele from either parent and an i allele from the other, making her genotype IBi. The brother with blood type O inherited an i allele from each parent, making his genotype ii. Therefore, the parents' possible genotypes could be IAi and IBi.
As background, the ABO blood groups are determined by three alleles. The IA and IB alleles are codominant, meaning that when present simultaneously, both are expressed, leading to the type AB blood group. The i allele is recessive to both the IA and IB alleles, and in the absence of either of these, the O blood type results.
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