Question

If a man having blood group AB marries woman having blood group B, then which of the blood groups is not possible in the progency?

• A. A
• B. B
• C. AB
• D. O

Answer 1

The correct option is: D

Explanation of the correct option:

The man has blood group AB, thus its genotype is $I^A$ $I^B$. The woman has blood group B, thus its genotype can either be $I^B$ $I^B$ or $I^B$ $I^O$.

In any of the cases, the genotype $I^O$ $I^O$ will not be produced. Thus, none of the offspring an has O blood group.

	$I^A$	$I^B$
$I^B$	$I^A{I}^B$	$I^B{I}^B$
$I^B$	$I^A{I}^B$	$I^B{I}^B$

"

or"

	$I^A$	$I^B$
$I^B$	$I^A{I}^B$	$I^B{I}^B$
$I^O$	$I^A{I}^O$

Explanation of the incorrect option:

Option A: If a man having blood group AB marries a woman having blood group B, then O blood group is not possible in the progeny.

Option B: If a man having blood group AB marries a woman having blood group B, then O blood group is not possible in the progeny.

Option C: If a man having blood group AB marries a woman having blood group B, then O blood group is not possible in the progeny.

Final answer: If a man having blood group AB marries a woman having blood group B, then O blood group is not possible in the progeny.