NEETBotanyCell Cycle and Cell Division
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In mitotic anaphase, centromeres split and sister chromatids separate, whereas in anaphase I of meiosis, homologous chromosomes separate but centromeres do not split. Reason (R): Mitosis is characterized as an equational division, whereas meiosis I is a reductional division. In the light of the abo
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
Step-by-step solution
Both statements are factually correct according to NCERT. In mitotic anaphase, the splitting of centromeres allows sister chromatids to separate, which maintains the chromosome number in the daughter cells. In anaphase I of meiosis, homologous chromosomes separate while sister chromatids remain associated at their centromeres, which halves the chromosome number. The mechanical events of chromosome separation described in the Assertion are the underlying cause for the division being equational or reductional as desc