Question

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

• A. Pleiotropy
• B. Polygenic traits
• C. Epistasis
• D. Multiple allelism

Answer 1

The correct option is D

Multiple allelism

In human beings, ABO blood groups are controlled by the gene I which has three alleles- $I^A,I^{B}and{I}^O$ 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.