The phenomenon of pleiotropism refers to:
more than two genes affecting a single character.
presence of several alleles of a single gene controlling a single crossover.
presence of two alleles, each of the two genes controlling a single trait.
a single gene affecting multiple phenotypic expressions.
, Pleiotropy is the phenomenon where a single gene exhibits multiple phenotypic expressions. A classic example provided is Phenylketonuria, where a single gene mutation leads to mental retardation and reduction in hair and skin pigmentation. In contrast, traits controlled by three or more genes are called polygenic traits .
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