What Are the Two Distinct Divisions of Meiosis?

The two distinct divisions of meiosis are meiosis I and meiosis II. Meiosis I is responsible for genetic diversity, while meiosis II reduces the amount of DNA in the daughter cells. At the end of meiosis II, each daughter cell has 23 chromosomes.

Meiosis I and meiosis II both have four stages: prophase, metaphase, anaphase and telophase. During prophase I, DNA condenses and the nuclear envelope disappears, making the chromosomes visible as tetrads. Genetic recombination occurs during prophase I and metaphase I, but it ends as soon as the tetrads pull apart in anaphase I. During telophase I, a nuclear envelope forms around the chromosomes with two chromatids, forming haploid nuclei.

In prophase II, the chromosomes with two chromatids begin to condense, forming a spindle. The chromosomes split during anaphase II, leaving each chromosome with only one chromatid. In telophase II, nuclear envelopes form around the chromosomes with single chromatids. The result of meiosis II is four haploid daughter cells.