Can you help me with this?anyone good with science?

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! =]

Can you help me with this?anyone good with science?
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.