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Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation2 Marks
Question
With the help of one example, explain the phenomena of co–dominance and multiple allelism in human population.
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Answer

ABO blood group in human being is an example of multiple allelism and co–dominance.
There are three alleles for the gene I, i.e., IA, IB, and i, thus, exhibiting multiple allelism.
When IA and IB are present together the blood group is AB. Both A and B blood groups are expressed. This is called co–dominance.

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