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NEET BIOLOGYMedium

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). 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 False, (R) is True.

B

Both (A) and (R) are True and (R) correctly explains (A).

C

Both (A) and (R) are True and (R) does not correctly explain (A).

D

(A) is True, (R) is False.

Step-by-Step Solution

:

  • Assertion (A) is True: Morgan and his group found that when two genes in a dihybrid cross were situated on the same chromosome, the proportion of parental gene combinations was much higher than the non-parental type. This physical association of genes is called linkage, and for such genes, Mendel's law of independent assortment does not hold true .
  • Reason (R) is False: Closely located genes are tightly linked and show very low recombination; they do not assort independently. They tend to be inherited together . Ideally, only distantly located genes on the same chromosome or genes on different chromosomes assort independently.
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