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  4. When a single gene influences more than one trait it is called :

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Q. When a single gene influences more than one trait it is called :

Haryana PMTHaryana PMT 2000

Solution:

When a single gene influences multiple phenotype expression it is called a pleiotropic gene. E.g. phenylketonuria, where a single gene mutation results in various phenotypic effects such as hair and skin colour, mental retardation, etc.