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Question

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

Assertion A: X chromosome is acrocentric and Y chromosome is submetacentric.

Reason R: This is based on the position of centromere on the chromosome.

In the light of the above statements, choose the most appropriate answer from the options given below

This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
A is not correct but R is correct

Assertion A Analysis

Assertion A states that the X chromosome is acrocentric and the Y chromosome is submetacentric. Standard biological classification identifies the human X chromosome as submetacentric and the human Y chromosome as acrocentric (or sometimes telocentric). Therefore, the classification provided in Assertion A is incorrect.

Reason R Analysis

Reason R states that the classification of chromosomes (e.g., metacentric, submetacentric, acrocentric, telocentric) is based on the position of the centromere. This statement is correct. The relative lengths of the chromosome arms, determined by the centromere's location, define these categories.

Conclusion

Based on the analysis, Assertion A is incorrect because the X and Y chromosomes are misclassified. Reason R is correct as it accurately describes the basis for chromosome classification. Thus, Assertion A is not correct, but Reason R is correct.

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