Assertion :The phenomenon of a single gene influencing more than one character is called pleiotropism. Reason: The gene responsible for phenylketonuria affects a number of abnormal phenotypic traits.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Pleiotropism can be defined as the condition in which a single gene affects a number of phenotypic traits in the same organism, for example, phenylketonuria, sickle cell anemia since both assertion and reason are true.
So, the correct answer is "Both Assertion and Reason are correct and Reason is the correct explanation for Assertion".

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