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Question

The existence of more than two allelic forms of a particular gene is termed as .

A
pleiotropy
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B
polygenic traits
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C
epistasis
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D
multiple allelism
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Solution

The correct option is D multiple allelism
In human beings, ABO blood groups are controlled by the gene I which has three alleles- IA,IB and IO also represented as i. This phenomenon is known as multiple allelism. There are more than two (in this case, three) alleles, governing the same character. But in an individual only two alleles can be present; multiple alleles can be found only when population studies are made.

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