HEREDITY
INCOMPLETE DOMINANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The O blood type will always be expressed in a human’s phenotype.
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Human blood type is an example of incomplete dominance.
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The A and B alleles will both be expressed in the heterozygote’s phenotype.
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A human will inherit all three alleles from their mom and dad.
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Detailed explanation-1: -Human blood type is an example of multiple allele inheritance. The O blood type is least common in the human population. The A and B alleles are codominant because both alleles are simultaneously expressed in the heterozygote. Human blood type is an example of incomplete dominance.
Detailed explanation-2: -Human blood type is determined by codominant alleles. There are three different alleles, known as IA, IB, and i. The IA and IB alleles are co-dominant, and the i allele is recessive. The possible human phenotypes for blood group are type A, type B, type AB, and type O.
Detailed explanation-3: -The ABO blood type is inherited in an autosomal codominant fashion. The A and B alleles are codominant, and the O allele is recessive.
Detailed explanation-4: -In other words, they inherited a recessive O allele from both parents. 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.
Detailed explanation-5: -Since both the A and the B alleles are visible in the blood, the trait is codominant. AB blood type is codominant because the red blood cells have the products of both the A and the B alleles of the ABO gene.