Tabla de Contenidos
Meiosis is divided into the following stages:
Meiosis II
- Prophase : this phase is divided, in turn, into five stages: leptotene, zygotene or zygonema, pachytene, diplotene, and diakinesis. During this phase, homologous chromosomes pair up and chromosome crossing over occurs. In this process, genetic exchange between homologous non-sister chromatids takes place.
- Metaphase – Chromosomes line up on the metaphase plate of the cell’s nucleus.
- Anaphase : Chromosomes separate evenly.
- Telophase – Each daughter cell possesses half the chromosomes of the parent cell, but one pair of chromatids.
meiosis II
- This stage is similar to mitosis. It is also subdivided into prophase, metaphase, anaphase, and telophase. Since recombination of chromosomes occurred in meiosis I, their chromatids are not identical. In meiosis II, the chromatids separate, forming two daughter cells.
Meiosis guarantees genetic variability, which is of vital importance because it allows the number of chromosomes necessary for the continuity of a species to be maintained.
Bibliography
- Pascual Calaforra, LF; Silva Moreno, FJ Basic principles of genetics . (2018). Spain. Synthesis.
- Turnpenny, P.D.; Ellard, S. Elements of Medical Genetics . (2018, 15th edition). Spain. Elsevier.
- Pinilla Bermúdez, G. Molecular biology. (2019). Colombia. Editorial The Modern Manual Colombia SAS
- Khan Academy in Spanish. Meiosis . Retrieved from https://es.khanacademy.org/science/ap-biology/heredity/meiosis-and-genetic-diversity/a/phases-of-meiosis .
- Khan Academy in Spanish. Phases of mitosis. Retrieved from https://es.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/cell-cycle/a/phases-of-mitosis.
