HEREDITY
MULTIPLE ALLELES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Type A
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Type B
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Type AB
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Type O
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Detailed explanation-1: -The human ABO blood group is controlled by a single autosomal gene with three alleles, IA, IB and i. Individuals with either the IAIA or IAi genotypes have blood type A. Those with IBIB or IBi have blood type B. Those with IAIB have blood type AB, and those with ii have blood type O.
Detailed explanation-2: -Because the child has blood type O, the child’s genotype must be OO. The mother is blood type B, which means that her genotype could be BB or BO. However, because she produced a child with type O, she must have passed an O allele on to the child, which means that the mother’s genotype must be BO.
Detailed explanation-3: -One parent with A and another with B can produce a child with A, B, AB or O blood types. If one parent has A and another has AB, they can either produce a child with A, B or AB blood types. If one parent has A and another has O, they can either produce a child with A or O blood types.