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Question

Both the parents of a child have same type of blood group that is AB. What is the type of blood group that cannot be seen in that child?

A
O
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B
AB
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C
A
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D
B
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Solution

The correct option is A O
Alleles IA & IB are dominant over i and IA & IB are codominant together.
Parents : IAIB×IAIB
Offspring : IAIA, IAIB, IBIB.
So, blood group ‘O’ cannot be seen in the offsprings as both parents lack that allele called i.

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