The phenomenon of pleiotropism refers to

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(D) Pleiotropism is a genetic phenomenon where a single gene influences two or more seemingly unrelated phenotypic traits. When a single gene affects

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$A$ single gene affecting multiple phenotypic expression

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(D) Pleiotropism is a genetic phenomenon where a single gene influences two or more seemingly unrelated phenotypic traits. When a single gene affects multiple phenotypic expressions,the gene is called a pleiotropic gene and the phenomenon is known as pleiotropism. An example of this is the gene responsible for phenylketonuria,which affects skin pigmentation,hair color,and mental ability.

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