First slide

Inheritance of One Gene

Question

A person having genotype $I^{A} I^{B}$ would show the blood group as AB. This is because of

Easy

A

Pleiotropy
B

Co-dominance
C

Segregation
D

Incomplete dominance

Solution

ABO system of blood group in humans is controlled by I gene having three alleles $I^{A}, I^{B}$ and i. Alleles $I^{A} and I^{B}$ are dominant over allele i. But when $I^{A} and I^{B}$ are present together in an individual, they show co-dominance and as a result, the phenotype is AB blood group.

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