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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): In grasshopper, all the ova produced by the female bear an X chromosome along with the autosomes. Reason (R): Grasshopper females have an XO chromosomal composition, making them heterogametic. In the light of the above statements, choose the correct answer from the options given below:

Options

  1. ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
  2. BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
  3. CAssertion (A) is true but Reason (R) is false.
  4. DAssertion (A) is false but Reason (R) is true.

Correct answer

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

Step-by-step solution

Assertion (A) is true. In grasshoppers, females are homogametic with an XX chromosomal complement. During oogenesis, all ova receive one X chromosome along with a haploid set of autosomes. Reason (R) is false. Grasshoppers exhibit male heterogamety, not female heterogamety. It is the male that has an XO chromosomal composition and produces two different types of sperms (with or without an X chromosome). Females have an XX composition. Answer: Assertion (A) is true but Reason (R) is false.

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