Polygenic trait:

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Is generally controlled by three or more gene.

Controls multiple traits in an individual.

Phenylketonuria is an example for polygenic inheritance.

It is expressed only in humans.

answer is A.

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Detailed Solution

The traits generally controlled by three or more genes are called as polygenic traits. Human skin colour is classic example for this. In pleiotropy one gene controls multiple traits in an individual. Phenylketonuria is an example of pleiotropy.

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