DNA Replication Without Cell Division — NEET Biology
📚 Practice ConceptCan there be DNA replication without cell division?
Which of the following statements about Meiosis II are NOT correct? S1: Meiosis II is initiated immediately after cytokinesis I, usually before the chromosomes have fully elongated. S2: The nuclear membrane reappears by the end of prophase II, preceding metaphase II. S3: Meiosis II is considered an equational division because the sister chromatids separate, resulting in a constant chromosome number from the start to the end of Meiosis II. S4: There is no DNA replication during interkinesis, the stage between Meiosis I and Meiosis II. S5: The final products of Meiosis II are two diploid daughter cells, each genetically identical to the cell that entered Meiosis II.
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Correct answer: B — S2 and S5 only
Let's evaluate each statement: S1: Meiosis II typically starts right after Meiosis I, often before chromosomes decondense much. So, S1 is correct. S2: During prophase II, the nuclear membrane *disappears*, not reappears, to prepare for metaphase II. So, S2 is NOT correct. S3: Meiosis II involves the separation of sister chromatids, akin to mitosis, leading to the same chromosome number (n) at the start and end of Meiosis II in terms of centromeres. Thus, it's equational in terms of chromosome number. So, S3 is correct. S4: Interkinesis is a short-lived stage between Meiosis I and Meiosis II, and DNA replication does not occur during this period. So, S4 is correct. S5: Meiosis II results in four *haploid* daughter cells, not two diploid cells. Due to crossing over in Prophase I and independent assortment, these cells are genetically *different* from each other and from the cell that entered Meiosis II. So, S5 is NOT correct. Therefore, statements S2 and S5 are NOT correct.
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