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NEETZoologyPrinciples of Inheritance and Variation

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Polyploidy is a phenomenon frequently observed in plants. Reason (R): It occurs due to the failure of segregation of chromatids during the cell division cycle. In the light of the above statements, choose the correct answer from the options given below:

Options

  1. ABoth (A) and (R) are true and (R) is the correct explanation of (A)
  2. BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
  3. C(A) is true but (R) is false
  4. D(A) is false but (R) is true

Correct answer

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

Step-by-step solution

Assertion (A) is true because polyploidy (an increase in a whole set of chromosomes) is a condition that is often seen in plants. Reason (R) is false because polyploidy occurs due to the failure of cytokinesis after the telophase stage of cell division. The failure of segregation of chromatids during the cell division cycle results in the gain or loss of a chromosome(s), which is known as aneuploidy, not polyploidy. Therefore, (A) is true but (R) is false. Answer: (A) is true but (R) is false

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