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Question

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

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

The correct option is B 50%
Parents of homozygous recessive * parents of heterozygous
In this case, 50% of offsprings will have O blood group. Each of the parents donates one of their two alleles to their offspring if any one parent has O blood group then the offspring has 50% chances of getting O blood group.
So, the correct option is '50%'.

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