A man with blood group ‘A’  marries a woman with blood group ‘B’.  What are all the  possible blood  groups of their offspring?

# A man with blood group 'A'  marries a woman with blood group 'B'.  What are all the  possible blood  groups of their offspring?

1. A

A, B, AB and O

2. B

O only

3. C

A and B only

4. D

A, B and AB only

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### Solution:

A man with blood group A marries a woman with blood group B.

The genotype of the man may be

The genotype of the woman can be

If the man has genotype ${\text{I}}^{\mathrm{A}}{\mathrm{I}}^{\mathrm{A}}$ and woman has genotype ${\text{I}}^{\mathrm{B}}{\mathrm{I}}^{\mathrm{B}}$ then all the offspring produced will have genotype of ${\text{I}}^{\mathrm{A}}{\mathrm{I}}^{\mathrm{B}}$. But we no such options.

Therefore, we will assume that the genotype of man is ${\text{I}}^{\mathrm{A}}\mathrm{i}$ and the genotype of woman is ${\text{I}}^{\mathrm{B}}\mathrm{i}$.

${\text{I}}^{\mathrm{A}}\mathrm{i}$ X ${\text{I}}^{\mathrm{B}}\mathrm{i}$.

Gametes of man is: ${\text{I}}^{\mathrm{A}}$ and i

Gametes of woman is: ${\text{I}}^{\mathrm{B}}$ and i

The genotypes of the offspring are ${\text{I}}^{\mathrm{A}}{\mathrm{I}}^{\mathrm{B}}$${\text{I}}^{\mathrm{A}}\mathrm{i}$${\text{I}}^{\mathrm{B}}\mathrm{i}$ and ii

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