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  4. Mother and father of a person with 'O' blood group have 'A' and 'B' blood group respectively. What would be the genotype of both mother and father ?

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Q. Mother and father of a person with '$O$' blood group have '$A$' and '$B$' blood group respectively. What would be the genotype of both mother and father ?

Principles of Inheritance and Variation

Solution:

If mother and father of a person with '$O$' blood group have '$A$' and '$B$' blood group then both mother and father will be heterozygous for '$A$' and '$B$' blood group respectively.
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The progeny with genotype '$ii$' will have '$O$' blood group.