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  4. A man of ‘A’ blood group marries a woman of ‘AB’ blood group. Which type of progeny would indicate that man is heterozygous?

Q. A man of ‘A’ blood group marries a woman of ‘AB’ blood group. Which type of progeny would indicate that man is heterozygous?

 7862  192 JIPMERJIPMER 2011Principles of Inheritance and Variation Report Error

Solution:

Possible blood groups of children born to parents having A and AB groups are A, B and AB. These parents cannot have children possessing O group of blood.
AB blood group parent is always a heterozygote while A blood group parent can either be a homo or heterozygote. If the male parent with blood group A in question is homozygote then :
No child with blood group B will be born. When the male parent is heterozygote then:
Only blood group B of progeny shows that male parent is heterozygous because only in blood group B allele i is present.

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