Question

albinism in humans is inherited as a simple recessive trait. determine the genotypes of the parents and offspring.
a) 2 normal parents have 5 children, four normal and one albino
b) a normal male and an albino female have 6 children, all are normal.
c) a normal male and an albino female have 6 children 3 are normal and 3 are albino

Answer 1

you still need help?

Answer 2

yes please

Answer 3

use "A" for normal allele and "a" for the recessive albinism allele.
For these questions, assume that a person can only have 2 alleles, either AA,Aa, or aa.
Since albinism is recessive, only people with aa genotype are albino.

A) If the parents are normal, then at least 1 of their alleles must be A. Since they have one albino child, both of them must carry the recessive allele. So the parents must both be Aa. The albino kid is aa and the other children are either AA or Aa

Answer 4

Try B and C on your own and I'll check your answer

Answer 5

ok thanks

Answer 6

B) male is AA and female is albino and aa all children would be Aa and normal?

Answer 7

Yes. =)

Answer 8

alright thanks. and for see would the male be Aa and he female aa and the three albino children would be aa and the three normal would be either AA or Aa

Answer 9

Almost. How do you get AA or Aa for the children?

Answer 10

there wouldn't be an AA because the male is a carrier of the recessive trait?

Answer 11

therefore the three normal children would all be Aa only

Answer 12

There wouldn't be AA because the female has the trait, so she can only pass on "a". But yes, the normal children will be Aa only.

Answer 13

awesome thanks for the help