Can you help me with this?a..

1.A human trait thats controlled by a single gene with multiple alleles is

a.dimples

b.blood type

c.height

d. skin color

2.a sex-linked disorder is

a. cystic fibrosis

b.sickle-cell disease

c. hemophilia

d. down syndrome

3. which of the following would most likely be used to diagnose down syndrome?

a. a karyotype

b. a pedigree

c. a blood-clothing test

d. a punett square

4. true or flase? A widows peak is a human trait controlled by a single gene.

5. Traits controlled by recessive alleles on the X chromosome are more common in males than in females. Explain why,

whoever ansers the most gets the ten points, idc if you dont answer them all i just really need help ok thank you to however answers! =]

1-I'm guessing a...the rest have so many variations they most likely rely on multiple genes.

2-c, hemophilia

3-a, a karyotype

4-I believe it's true, since it's either we have it or we don't.

5-Because males have 1 X and 1 Y, while females have 2 X's. Since the X chromosome is bigger and carries so much more genetic information, if a female has the recessive disease gene on one X chromosome, chances are higher that she'll have the dominant non-disease gene on the other X chromosome. If the male has the recessive gene on his single X, he has no chance of having the dominant gene on his Y. So the female would be a passive carrier and the male would actually be affected. A female would only be affected if she was unlucky enough to get 2 recessive disease genes on both her chromosomes, which could happen if a diseased male mated with a carrier female.

Good luck with 1 and 4. I'm pretty sure the rest of my answers are right.