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Question

The gene I that determines ABO blood groups has three alleles IA,IB and IO . The correct sequence of dominance of these alleles is


A

IA=IB>IO

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B

IA=IB=IO

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C

IA>IB>IO

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D

IA<IB<IO

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Solution

The correct option is A

IA=IB>IO


ABO blood grouping in human beings is controlled by a gene I which has three alleles- IA,IB and IO. Among these, IA and IB are equally dominant indicating codominance, and they are dominant over IO or i, which is a recessive allele.


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