AP Bio genetics question? A man and a woman who are both heterozygous for blood group A decide to produce four children.

Question

A man and a woman who are both heterozygous for blood group A decide to produce four children.

a. What are the possible phenotypes of these children?

b. What are the possible genotypes of these children?

c. What are the chances that all four children will be blood group A?

d. What are the chances that two children will be A and two children will be type O?

Answer 1

a. Phenotypes: A, O

b. Genotypes: AA, Ai, ii

c. .75*.75*.75*.75= 32% chance

d. .75*.75*.25*.25 + .25*.25*.75*.75 + .75*.25*.75*.25 + .25*.75*.25*.75 + .75*.25*.25*.75 + .25*.75*.75*.25 = 21% chance

Answer 2

HI Tzuyu C., This question is really more one of abnormal psychology. "Produce 4 children"? Ick!

That aside, you have Ao x Ao

So 4 genotypes will be AA, Ao(2), and oo and the phenotypes will be A(3) : O(1).

That is, assuming that information on B genotypes wasn't carelessly omitted!

-Cheers, -- Mr. d.