GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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type A
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AA
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AB
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BB
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Detailed explanation-1: -Someone with blood type AB must have both the A and B alleles. The genotype must be AB.
Detailed explanation-2: -ABO blood groups in humans are controlled by the gene I. It has three alleles-IA, IB and i. Since there are three different alleles, six different genotypes are possible.
Detailed explanation-3: -The AO genotype results in Type A blood because A is dominant over O. Genotypes BB and BO refer to individuals having either two “B” alleles for blood type, or one “B” allele and one “O” allele. Both of those genotypes results in having Type B blood. The BO genotype results in Type B blood because B is dominant over O.
Detailed explanation-4: -The A and B alleles are codominant. Therefore, if an A is inherited from one parent and a B from the other, the phenotype will be AB. Agglutination tests will show that these individuals have the characteristics of both type A and type B blood.