A cross between two parents produced four offspring's with blood groups AB, BB, BO and AO. what is the blood group of their parents?

Answer Details

The blood group of the parents can be determined using the principle of codominance and the possible genotypes of the parents. Each parent contributes one allele to their offspring, and the offspring's blood group is determined by the combination of the two alleles received from their parents. Since the offspring have blood groups AB, BB, BO and AO, we can deduce that one of the parents must have contributed an A allele and the other parent contributed a B allele. This is because the blood groups AB, BB and AO all have either an A or B allele, while the blood group BO has an O allele from each parent. Therefore, the possible genotypes of the parents are IAIA and IBIO, IAIB and IBIB, or IAIB and IBIO, where IA and IB represent the A and B alleles respectively, and IO represents the O allele. The only genotype combination that can produce offspring with blood groups AB, BB, BO and AO is IAIB and IBIO. Therefore, the blood group of the parents is AB and BO.