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Question

A child with mother of 'A' blood group, and father of 'AB' blood group will have blood group

A
O
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B
A
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C
A and O
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D
O and B
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E
A, AB or B
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Solution

The correct option is E A, AB or B
Human blood group inheritance is the example of codominance and multiple alleles. It is governed by three alleles namely IA, IB and IO. IA and IB show codominance while allele IO is recessive to both IA and IB.
Genotype of a person with “A” blood group can be IAIO or IAIA and that of parent with AB blood group is IAIB. The alleles IA, IO and IB can make three genotypic combinations, namely IAIA, IAIO, IAIB and IBIO. Thus, the possible blood group of their children are A, B and AB. To have a child with O blood group, both parent should have at least one IO allele; thus they can’t have a child with O blood group. This makes option A, C and D wrong. Correct answer is E.
Cross 1
Parent generation : IA IA x (IA IB)
Gametes :
IA IA-->
(IA IB)
IAIA
IAIAIA IAIA
IBIAIBIAIB

F1 generation phenotypic ratio = 1 A group : 1 AB group

Cross 2
Parent generation : IA IO x (IA IB)

Gametes :
IA IO -->
(IA IB)
IA IO
IA IAIA IA IO
IB IAIB IB IO

F1 generation phenotypic ratio = 2 A group : 1 AB group : 1 B group

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