Four children belonging to the same parents have the following blood groups A, B, AB and O. Hence, the genotypes of the two parents are …………

(A)

Both parents are homozygous for ‘A’ group

(B)

One parent is homozygous for ‘A’ and another parent is homozygous for ‘B’

(C)

One parent is heterozygous for ‘A’ and another parent is heterozygous for ‘B’

(D)

Both parents are homozygous for ‘B’ group

K-CET-2011 Medium

Answer & Solution:

Solution: One parent is heterozygous for ‘A’ and another parent is heterozygous for ‘B’

The genotypes of the parents must be AO(\(I^ai^o\) )and BO(\(I^bi^o\)). The phenotypes of these individuals would be A and B respectively.

Thus, the children of these parents may have possibility of having any one of the four blood groups- A, B, AB and O as combination of the four alleles present in the chromosomes of the parents can combine to give one of the four blood groups in the offspring during fertilisation.

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Four children belonging to the same parents have the following blood groups A, B, AB and O. Hence, the genotypes of the two parents are …………

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