Occasionally, a single gene may express more than one effect. The phenomenon is called

multiple allelism

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mosaicism

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pleiotropy

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polygeny.

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Solution

The correct option is C pleiotropy
When there are three or more alternative forms of a gene, it is called multiple allelism. Polygeny suggests that humans evolved from several different ancestors. When a single gene has more than one effects, it is called pleiotropy.
So, option C is the correct answer.

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Usually a single gene controls a single phenotype. Sometimes one gene may influence more than one phenotypic trait. This phenomenon is known as __

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