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3 years ago

Why are there so many variations of human skin color

Biology

2 answers:

riadik2000 [5.3K]3 years ago

6 0

Answer:

Because if you believe in God and read the bible it would tell you a lot why there is many skin color.

Explanation:

ArbitrLikvidat [17]3 years ago

3 0

Answer:

we all just some eggs fr

Explanation:

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Small lizards have difficulty defending their territory, but large lizards are more likely to be preyed upon by owls. which type

IceJOKER [234]

<span>Stabilizing selection is at work in this case. This is the force that allows a population to gradually center on a mean value due to a presence of a non-extreme bodily trait. The more extreme examples of the trait lead to the organisms being selected out, and the trait that is the least conspicuous wins out in the long-run.</span>

3 0

3 years ago

Having freckles (F) is dominant over not having freckles (f). A parent with freckles is crossed with a parent without freckles.

Step2247 [10]

Answer:

This is a trick question, and only because the question is vague

Explanation:

Use a Punnet Square to figure out the percentages.

If the parent with freckles (let's just call them Parent A) is homozygous dominant, their genotype would be FF. The parent without freckles (Parent B) has a genotype of ff.

In any situation, the probability of these two having a child that is homozygous dominant for freckles is 0%. (see punnet squares for more info).

Now here's where it gets a little more confusing because the question is kind of vague on this.

Assuming that Parent A is homozygous dominant (both genes for this are dominant (FF)), then the probability of having a heterozygous (non-identical genotype letters, meaning they carry the recessive trait) genotype is 100%. However, if Parent A is also heterozygous, then that percentage decreases to 50%

For Situation A (Parent A is homozygous dominant), the probability of a homozygous recessive genotype is 0%

For Situation B (Parent A is heterozygous dominant), the probability of a homozygous recessive child is 50%.

Please see the Punnet square I made for more information.

Key:

- Homozygous Dominant: FF

- Heterozygous Dominant: Ff

- Homozygous Recessive: ff

(heterozygous recessive does not exist, because that would mean one of the genes is dominant, which would overpower the recessive gene)

I really hope this helps, and if you're confused by this, please do not hesitate to let me know!

8 0

3 years ago

Read 2 more answers

___________that increase reproductive success will have a greater

Svetradugi [14.3K]

Reproductive success

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3 years ago

1. Discuss gravitational force in our universe and how it words. 2. Why is it critical to our universe? 3. Name at least three i

abruzzese [7]

<h2>Answer 1:</h2>

The gravitational force is a force that attracts any objects with mass. Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy including planets, stars, galaxies, and even light are brought toward one another.

Answer 2:

Gravity keeps things together. It is a force that attracts matter towards it. Anything with mass creates gravity, but the amount of gravity is proportional to the amount of mass.

Gravitational force is critical to our universe because with out gravitational force we cannot walk on earth, all the matter on earth cannot stay on it with out gravity. Everything will start floating in air with out gravity.

<h2>Answer 3:</h2>

Gravity is the powerful force that glues our universe together.

One of the most noticeable effects of gravity in the solar system is the orbit of the planets.
The planet keeps moving but is always caught up in the push-pull forces caused by the interaction of these gravitational forces. As a result, the planet begins orbiting the sun.
The same phenomenon causes the moon to orbit around the Earth except its the Earth's gravitational force not the sun's that keeps it moving around us.

5 0

3 years ago

How do oxygen and carbon dioxide cross capillary walls?

muminat

The answer is diffusion.

The most important mechanism that enables oxygen and carbon dioxide (but as well other small molecules such as glucose, amino acids, wastes) across capillary walls is diffusion. Diffusion is a net movement of molecules through some barrier from an area of high concentration to the area of low concentration. When blood rich in oxygen reaches capillaries close to the cell, now there <span>is </span>more oxygen in the capillaries than in the cells and by diffusion, oxygen will pass capillary walls and enter the cell. Since blood in capillaries lacks in carbon dioxide, it will easily leave the cells and enter the blood. It should be taken into consideration that capillary walls may be fenestrated, continuous, and discontinuous which can affect movement through them.

4 0

3 years ago