A husband is homozygous for blood type A and his wife is heterozygous for blood type B. What are the possible blood types for their offspring?

Question

Select TWO correct answers.

B

O

ABO

AB

A

Answer 1

To determine the possible blood types of the offspring from a homozygous blood type A husband and a heterozygous blood type B wife, we need to understand the genotypes involved.

• The husband, being homozygous for blood type A, has the genotype AA.
• The wife, being heterozygous for blood type B, has the genotype BO.

Now, we can set up a Punnett square to find the possible genotypes of their offspring:

      B    O
    __________
A |   AB   |  A   |
    __________
A |   AB   |  A   |
    __________

From this Punnett square, we can see the possible genotypes for their offspring:

1. AB (from A and B)
2. A (from A and O)

Now, converting these genotypes to blood types, we find:

• Genotype AB gives blood type AB.
• Genotype A gives blood type A.

Therefore, the possible blood types for their offspring are AB and A.

Thus, the TWO correct answers are:

• A
• AB