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Question

Assertion :Sex-influenced genes are autosomal genes in both males and females. Reason: The phenotypic expression of sex-influenced genes is different in different sexes, dominant in one sex and recessive in the other.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
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.
Sex-influenced traits are the ones which shows sex-specific phenotypes in genotypically same male and female. These are autosomal traits wherein dominance of the governed gene is dependent on the sex of the individual. The assertion is correct.
Therefore, a heterozygous genotype for these traits may exhibit dominant genotype in males and recessive in females owing to the hormonal differences between the two sexes. For example, baldness in human. The reason is correct.
Therefore, the correct answer is option A.

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