DNA does replicate for meiosis, but only once, before meiosis begins, during the S phase of interphase; there is no DNA replication between meiosis I and meiosis II.

Does DNA replicate in meiosis?

  • DNA replication happens once , before meiosis starts, in the S phase of interphase (sometimes called “interphase I”).
  • After this single replication, the cell goes through two divisions (meiosis I and meiosis II) without any further DNA copying.

So the cycle is: replicate DNA → meiosis I → meiosis II → four haploid cells.

Quick Scoop: what happens when

  • Before meiosis (S phase): Each chromosome copies itself, forming two sister chromatids held together at the centromere.
  • Meiosis I: Homologous chromosome pairs separate into two cells, but each chromosome is still made of sister chromatids.
  • Meiosis II: Sister chromatids finally separate, giving four cells, each with one chromatid per chromosome (haploid gametes).

Because chromosomes are already duplicated before meiosis I, there is no need for another DNA replication between meiosis I and II.

Why not replicate twice?

  • If DNA replicated twice for two divisions, the chromosome number would not be reduced to half, and gametes would end up with too many chromosomes.
  • Replicating once but dividing twice is the trick that allows meiosis to produce four genetically unique haploid cells from one diploid cell.

In short: DNA replication occurs once before meiosis , not during or between the two meiotic divisions.

TL;DR: For the keyword “does dna replicate in meiosis”: DNA replication happens once before meiosis, in S phase, followed by two divisions with no further replication.

Information gathered from public forums or data available on the internet and portrayed here.