Principle of Inheritance and VariationMediumBloom L3
Question
Mother and father of a person with '0' blood group have 'A' and 'B' blood group respectively. What would be the genotype of both mother and father.
Options
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 heterozygous for 'B'
C.Both mother and father are hetrozygous for 'A' and 'B' blood group respectively
D.Both mother and father are homozygous for 'A' and 'B' blood group respectively.
Solution
Sol.(c) [Key Concept: ABO Blood Groups — Deducing Parent Genotypes]
The child with blood group O has genotype ii — received i allele from BOTH parents. Mother (blood group A) must have contributed i allele → mother's genotype is IA i (heterozygous A, carrier of i). Father (blood group B) must have contributed i allele → father's genotype is IB i (heterozygous B, carrier of i). Cross: IA i × IB i → offspring: IA IB (AB), IA i (A), IB i (B), ii (O). Both parents are HETEROZYGOUS for their respective blood groups. Answer: (c).
NEET / AIPMT Questions (2013–2017)
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