A man of blood group A marries a woman of blood group AB. Which type of progeny indicates that man is heterozygous?

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TestHub · Accepted Answer

If the man is homozygous for A blood group then offspring can never have a B blood group in the given cross. But if the man is heterozygous, the probability of offspring having B blood group is there. Hence the presence of the B blood group in offspring will be indicative of heterozygosity of the man. You can check this by application of punnet square. Man Woman I A i o I A I A I A I A i o I B I A I B I B i o

Man Woman	$I^{A}$	$i^{o}$
$I^{A}$	$I^{A} I^{A}$	$I^{A} i^{o}$
$I^{B}$	$I^{A} I^{B}$	$I^{B} i^{o}$

Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

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