Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason

Assertion (A): Mendel's law of Independent assortment does not hold good for the genes that are located closely on the same chromosome.

Reason (R): Closely located genes assort independently.

In the light of the above statements, choose the correct answer from the options given below:

• A. (A) is correct but (R) is not correct
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is not correct but (R) is correct
• D. Both (A) and (R) are correct and (R) is the correct explanation of (A)

Answer 1

The correct option is A (A) is correct but (R) is not correct

Mendel’s Law of independent assortment states that, when two pairs of traits are considered, the segregation of one pair of traits is independent of the other. But if the traits are present on the same chromosome or homologous pairs of chromosomes, their segregation won’t be independent of each other. On the other hand, if the traits are present on non- homologous pairs of chromosomes, their segregation is independent of each other as observed by Mendel in Pisum sativum.

Mendel's law of independent assortment does not hold true for the genes that are located closely on the same chromosome.

All the genes present on the same chromosome are inherited together generation after generation retaining the parental combination, which leads to lack of independent assortment.

Therefore, Assertion is correct whreas its Reason provided here is incorrect