Class 12 Biology Inheritance Variation CO-DOMINANCE


The two alleles are able to express themselves independently when present together.

For example: ABO blood grouping in humans is controlled by gene I. It has three alleles IA, IB and i.

IA, IB are dominant over i. If IA and I are present, only IA expresses. IA and IB are present both of them express each other.

ABO blood grouping is also a good example of multiple alleles.

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