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Question

Regarding ABO blood group, if one parent is homozygous and other is heterozygous, what are the chances that their child will have ‘O’ blood group?

A
Zero
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B
25%
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C
50%
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D
75%
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Solution

The correct option is C 50%
Blood group ‘O’ contains both antibodies but no antigens. The alleles IA and IB are codominant and are dominant over the allele IO(IA=IB>IO). If one parent is homozygous (IOIO) and other is heterozygous (IAIOIAIO), their progeny could be

Genotype ratio = 1:1

Therefore, there is 50% chances that the child will have ‘O’ blood group and 50% chances to have blood group either ‘A’ or ‘B’.

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