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NEET 2022 · BiologyPrevious Year Question

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 goods for the genes that are located closely on the same chromosome. Reason (R): Closely located genes assort independently. Answer from the options given below:

Answer: (C) is correct but (R) is not correct. Answer: (C) is correct but (R) is not correct Solution: Assertion is correct: Mendel's law of independent assortment fails for genes located close together on the same chromosome because such linked genes tend to be inherited together.

  1. A.Both (A) and (R) are correct and (R) is the correct explanation of (A)
  2. B.Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  3. C.is correct but (R) is not correct✓
  4. D.is not correct but (R) is correct

Correct Answer

(C) is correct but (R) is not correct

Solution & Explanation

Answer: (C) is correct but (R) is not correct Solution: Assertion is correct: Mendel's law of independent assortment fails for genes located close together on the same chromosome because such linked genes tend to be inherited together. The Reason is wrong: closely located (tightly linked) genes do NOT assort independently; rather they assort together, while only distantly located genes assort more independently due to recombination. Since A is true and R is false, option C is correct. NCERT Reference: NCERT Class XII, Ch 4, p.77, lines 35-39: "Mendel's law of independent assortment does not hold true for the genes that were located on the same chromosomes. These genes were called as 'linked genes'. Closely located genes assorted together, and distantly located genes, due to recombination, assorted independently."

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