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

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

Principles of Inheritance and Variation

Solution:

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.