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
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 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.
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.
| LIST-I | LIST-II |
|---|---|
| A. Moss | I. Wolffia |
| B. Pteridophyte | II. Sequoia |
| C. Gymnosperm | III. Selaginella |
| D. Angiosperm | IV. Sphagnum |