Question

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 ?

• A. Mother is homozygous for '$A$' blood group and father is heterozygous for '$B$'
• B. Mother is heterozygous for '$A$' blood group and father is homozygous for '$B$'
• C. Both mother and father are heterozygous for '$A$' and '$B$' blood group, respectively
• D. Both mother and father are homozygous for '$A$' and '$B$' blood group, respectively

Answer 1

Answer: (C)

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.

The progeny with genotype '$ii$' will have '$O$' blood group.