First husband of ‘X’ had A blood group and their child had an O blood group. She remarried and her second husband had B blood group and their child had AB blood group. What is the ABO genotype of ‘X’ and her blood type?

ii, blood type O

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I^{B} i

, blood type B

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I^{A} I^{B}

, blood type AB

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I^{A} i

, blood type A

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Solution

The correct option is D $I^{A} i$ , blood type A
The child from the first marriage had O blood group, i.e., the child had $i i$ genotype. So, each one of the alleles of the genotype $i i$ would come from each of the parents. That means both parents had " $i$ " in their genotype. Therefore, the genotype of X is $I^{A} i$ . The cross is shown below:

Gametes $I^{A}$ $i$

$I^{B}$ $I^{A} I^{B}$
(AB blood group)
$I^{B} i$
(B blood group)

$i$ $I^{A} i$
(A blood group) $i i$
(O blood group)

2nd marriage:
B blood group (husband) X A blood group (wife)
$↓$
AB blood group (child)

The child after second marriage had AB blood group. But the husband is B type blood. Hence, "X" (wife) will have A type blood group.

So, the mother has a genotype $I^{A} i$ .

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Inheritance of ABO Blood Groups

Standard XII Biology

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Gametes	$I^{A}$	$i$
$I^{B}$	$I^{A} I^{B}$ (AB blood group)	$I^{B} i$ (B blood group)
$i$	$I^{A} i$ (A blood group)	$i i$ (O blood group)