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Question

If the mother has a blood group B with a homozygous genotype and father has a blood group A of unknown genotype, then the possible blood groups of the children are:


Correct Answer
A
AB and B
Your Answer
B
AB and A
Your Answer
C
A and B 
Your Answer
D
O

Solution

The correct option is D AB and B
In the given question, the mother has blood group B with homozygous genotype and hence can be represented as IB IB.
However, the father has a blood group A with unknown genotype. Hence, he can have a homozygous (IA IA) or a heterozygous (IA IO) genotype.
- If the father is homozygous,

then the blood group of the progeny can be AB 
-If the father is heterozygous,

then blood group can be AB or B.

Hence, progeny can have either AB or B as their blood group.

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