Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).
Assertion (A) : Human skin colour is an example for polygenic trait.
Reason (R) : Human skin colour phenotypic expression is controlled by three genes.
In light of the above statements, choose the correct answer from the options given below.

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(A) is true but (R) is false.

Both (A) and (R) are false.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

answer is A.

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Detailed Solution

Some traits are generally controlled by three or more genes and are thus called as polygenic traits. Besides the involvement of multiple genes polygenic inheritance also takes into account the influence of environment.

Human skin colour is a classic example for this. .Three genes A, B, C control skin colour in human with the dominant forms A, B and C responsible for dark skin colour and the recessive forms a, b and c for light skin colour.

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