We explain what meiosis is and what each of its phases consists of. Also, what is mitosis and its differences with meiosis.
Meiosis or meyosis is called one of the ways in which cells reproduce , characterized by providing genetic variety in the descending cells , which is key to sexual reproduction: the one that involves two different individuals to produce a new one, whose material Genetic will be a combination of the previous two.
Meiosis consists of the division of a diploid cell (2n), that is, provided with two sets of chromosomes (most of our cells are of this type), into four haploid cells (n), that is, provided with half of the genetic load of the anterior cell.
These haploid cells operate as a seed of a new individual, once it is fused with another from another individual, each contributing half of its genetic load. This is how gametes, the reproductive cells of animals and humans work.
Thus, meiosis is a process prior to sexual reproduction , since gametes (ovules and spermatozoa, for example) are formed in it. However, it is also part of complex life cycles, in algae, fungi and other simple eukaryotes, to achieve some generational alternation, reproducing their cells in a sexual and asexual way at different stages.
Meiosis was discovered in the 19th century by the German biologist Oscar Hertwig (1849-1922), from his studies with sea urchin eggs. Since then, successive research contributed to a better understanding and to understand its vital importance in the evolution of higher forms of life.
Meiosis is a complex process that involves two distinct phases: meiosis I and meiosis II. Each of them is composed of several stages: prophase, metaphase, anaphase and telophase. This merits a more detailed study:
The differences between mitosis and meiosis are several:
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