What is meiosis?
Meiosis is a biological term for the process of dividing a eukaryotic cell. As a result of meiosis, the cell nucleus is divided, and the number of its chromosomes is reduced (reduced) by half.
Let us examine in more detail what meiosis is and why it is needed.
Meiosis - how does it work?
Meiosis is a rather complicated process, it consists of many phases, including the exchange of genetic information. In a broad sense, meiosis can be divided into two phases - reduction and equational, while the second proceeds much faster. In the first phase, division processes are accompanied by the exchange of genetic information; in the second, there is no gene exchange.
Reducing the number of chromosomes as a result of meiosis makes important sense. If the number of chromosomes did not decrease in the process of division, the number of fetal chromosomes would double by the merging of the egg cell and the spermatozoid, twice more, and so on in the next generation.
Value of meiosis
So, meiosis performs the function of reducing chromosomes, eliminating their endless growth.But, in addition, meiosis makes it possible to create new combinations of genes, developing the resistance of the species.
Meiosis of the simplest
Meiosis of the simplest proceeds not like in multicellular ones. The simplest can have only one division, while multicellular ones are capable of two consecutive meiotic divisions. It is believed that single-stage meiosis is one of the first steps in the evolution of two-stage meiosis.