Blood group A can have genotypes I^A I^A or I^A i, and blood group B can have genotypes I^B I^B or I^B i. A child with blood group O has the genotype ii. This genotype can only be formed if both parents contribute an 'i' allele.
Father and mother having A and B blood group respectively
Asked in UPSC CAPF 2011 · Topic: Heredity (Multiple Alleles and ABO Blood Groups)
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