Question: 166: Regarding Meiosis, which of the statements is incorrect?
(1) Pairing of homologous chromosomes and recombination occurs in Meiosis-I
(2) Four haploid cells are formed at the end of Meiosis-II
(3) There are two stages in Meiosis, Meiosis-I and II
(4) DNA replication occurs in S phase of Meiosis-II
Answer: Option (4)
Explanation:
Meiosis consists of two successive divisions, Meiosis-I and Meiosis-II,
which together result in the formation of haploid cells from a diploid cell.
In Meiosis-I, homologous chromosomes pair with each other and undergo recombination
or crossing over during prophase-I, so statement (1) is correct.
Meiosis-II resembles mitosis and results in the separation of sister chromatids.
At the end of Meiosis-II, four haploid cells are formed, making statement (2) correct.
Statement (3) is correct because meiosis indeed occurs in two stages: Meiosis-I and Meiosis-II.
Statement (4) is incorrect because DNA replication occurs only once during the S phase before Meiosis-I.
There is no DNA replication between Meiosis-I and Meiosis-II.
Therefore, the incorrect statement is option (4).