In meiosis II, division of the daughter cell produces a second polar body, and a single haploid cell, which enlarges to become an ovum. Meiosis generates gamete genetic diversity in two ways: 1 Law of Independent Assortment. The sister chromatids by convention are now called sister chromosomes as they move toward opposing poles.
The diploid zygote undergoes repeated cellular division by mitosis to grow into the organism. August PLOS Genet. The end result is production of four haploid cells n chromosomes, 23 in humans from the two haploid cells with n chromosomes, each consisting of two sister chromatids produced in meiosis I.
Homologous pairs move together along the metaphase plate: As kinetochore microtubules from both spindle poles attach to their respective kinetochores, the paired homologous chromosomes align along an equatorial plane that bisects the spindle, due to continuous counterbalancing forces exerted on the bivalents by the microtubules emanating from the two kinetochores of homologous chromosomes.
Bacteriological Reviews. If these oocytes are fertilized by sperm, they will resume and complete meiosis. Advertisement Hide. Like a recipe book it holds the instructions for making all the proteins in our bodies.
The Biology Place. Before meiosis begins, some important changes take place within the parent cells. Chromosomes condense further during the diakinesis stage, from Greek words meaning "moving through". Aire Angeline. Full Name Comment goes here. Bibcode : PLoSO
For excessive constriction of the pupils, see Miosis. Meiosis was discovered and described for the first time in sea urchin eggs in by the German biologist Oscar Hertwig. Europ J Protistol. Taylor, K. It is the stage of the life cycle when a cell gives rise to two haploid cells gametes each having half as many chromosomes.