Cell division

Meiosis Stages and Phases in Cell Division

Regen Center Glossary

The process of Cell meiosis occurs through cell division. In this Stage, the cells generate gametes (egg or sperm) and carry half of the normal chromosome count. After fertilization, the resulting embryo formation (after gamete) shall then finally contain the right number of chromosomes. Meiosis is a special type of cell differentiation that produces gametes with half as many chromosomes. Meiosis I is a type of cell division unique to germ cells, while meiosis II that is very similar to mitosis.[1]

The First stage of Meiosis “I” reduces the ploidy levels from 2n to just n while the second stage of Meiosis “II” divides the last remaining set of chromosomes in a “mitosis-like” process.). The old name for meiosis was reduction/ division. Two daughter cells are formed during telophase I. These usually go immediately into the second cell division (meiosis II) to separate the chromatids.[2]


The steps involved in meiosis are similar to mitosis and even have the same names.Alleles are what help to facilitate this drive can also spread if they team up with the meiotic drive alleles. During the reduction division stage of meiosis I, cells go from a diploid to a haploid state.

What came first…the chicken or the egg?

The term “disjunction” describes the separation of the chromosomes in meiosis stage I or “sister” chromatids in meiosis stage II. NOTE** There is also an alternative theory about the origins of meiosis. This theory states that meiosis division evolved from mitosis. To better understand meiosis in eukaryotes, it’s very important to understand how meiosis can differentiate into a single cell eukaryotes. This is a vital function of the mitosis separation process. [3]


The mechanism by which meiosis occurs is the process to joining two genomes. That second division divides the number of chromosomes in half.

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Published Clinical Citations

  • [1] ^ Gerton, J. L., & Hawley, R. S. Homologous chromosome interactions in meiosis: Diversity amidst conservation. Nature Reviews Genetics 6, 477–487 (2005) doi:10.1038/nrg1614

  • [2] ^ Lopez-Maury, L., Marguerat, S., & Bahler, J. Tuning gene expression to changing environments: From rapid responses to evolutionary adaptation. Nature Reviews Genetics 9, 583–593 (2008) doi:10.1038/nrg2398

  • [3] ^ Marston, A. L., & Amon, A. Meiosis: Cell-cycle controls shuffle and deal. Nature Reviews Molecular Cell Biology 5, 993–1008 (2004) doi:10.1038/nrm1526