Questions 20-21 refer to the following. A normal visioned woman who is a carrier

Question

Questions 20-21 refer to the following. A normal visioned woman who is a carrier for colorblindness and also heterozygous for type o and A blood marries a colorblind man who has type AB blood. Recall that colorblindness is inherited as an X-linked recessive trait. In the A, B, O blood typing system, the alleles for A and B are co-dominant. The allele for o is recessive to both the A and B alleles. 20. In regard to blood type, the offspring will be: a) all type AB b) all type A c) 1/2 type A:1/2 type B d) 1/4 type 0:1/4 type A:1/4 type B:1/4 type AB e) 1/2 type A:1/4 type B:1/4 type AB 21. Considering all the offspring, what fraction will be colorblind and female with type A blood? a) 1/2 b) 1/4 c) 1/8 d) 1/16 e) none

Explanation / Answer

20. The offspring would be,

c. 1/2 type A: 1/2 type B.

This is due to the recessive nature of allele.

21. The fraction is,

b. 1/4(1/2×1/2).

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