Question

a man of blood group A married a woman of blood group B the first child of the couple has O blood group what other blood group are expecting in the future child

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Answer 1

ANSWER

Genotype of a heterozygous man with A blood group I

A

I and that of a homozygous man with A blood group I

A

I

A

.

A cross between heterozygous man with A blood group and woman of AB blood group produce progeny with A, AB and B blood groups.

Gametes

I

A

I

I

A

I

B

I

A

I

I

A

I

A

I

A

I

A

I

I

B

I

A

I

B

I

B

I

On the other hand, a cross between homozygous man with A blood group, I

A

I

A

and woman of AB blood group, I

A

I

B

produce progeny with A, AB blood groups, none of the child will have B blood group.

Gametes

I

A

I

A

I

A

I

B

I

A

I

A

I

A

I

A

I

A

I

A

I

A

I

B

I

A

I

B

I

A

I

B

Hence, a child with B blood group would indicate that man is heterozygous A.

Thus, the correct answer is option D.