Genetics question?

Question

Inheritance of skin color and height in humans are best explained by:
A. polygenic inheritance.
B. multiple alleles.
C. epistasis.
D. incomplete dominance.

A colorblind mother cannot produce a:
A. normal son.
B. colorblind daughter.
C. carrier daughter.
D. both B and C.

What is the percentage of colorblind daughters expected from a woman with normal color vision (\who is not a carrier) and a color blind man?
A. 100%.
B. 75%.
C. 50%.
D. 0%.

Height of tobacco plants is an example of polygenic inheritance. The offspring of a very tall plant and a very short plant will be:
A. all tall.
B. all short.
C. all of medium height.
D. a bell-shaped curve of various heights.

The F2 generation of the above cross will be:
A. all tall.
B. all short.
C. all of medium height.
D. a bell-shaped curve of various heights.

Answer 1

First question: a
Second question: d
Third question: d
Fourth question: d
Fifth question: d

Remember to research specifics behind the epidemiology of each cross, and USE YOUR MENDELIAN CROSSES!

Answer 2

1. A
2. A (all her sons will be colourblind as she is the only one to pass on an X chromosome and both X's in this case a affected and the Y chromosome (produced by the father) has no influence on this condition)
3. 0%..all the females (dominant normal vision allele) X chromosomes will mask the males X affected, so all females will be carriers and not affected.
4. D....thats the nature of polygenic inhertiance...you can get the whole range.
5. D.....same principle.

Answer 3

1. A polygenic inheritance
2.A, I think. A carrier daughter can be produced, thus negating answer C ( D is wrong )
3.D 0%
4. D bell curve of traits
5. D That is what polygenic is. a normal distribution.

ecolink is correct and i should have used a simple branch diagram to show that. That is what happens in variant human mating.

Answer 4

I'm pretty sure the first one is A polygenic inheritance

I'm positive that the answer to the 2nd one is A.

The answer to the 3rd one is also definitely.D 0%

The answer to 4 is definitely D, bell curve of traits

The answer to 5 is also definitely D, bell curve of traits

Answer 5

Answers should be A, A, D, C, D

I have a different answer than your other responders on the fourth question. Here's my thinking:

A very tall individual will have all capital letters. If there are four pairs of alleles governing this trait (just choosing four as an easy number to work with), then the very tall is AABBCCDD. The very short is aabbccdd.
All of their offspring are AaBbCcDd ... medium.