Friday, August 27, 2010

MEIOSIS

Meiosis is one of the cell divisions happening in our body. Meiosis happens only in germ cells or the gametes.It has many difference on mitosis like it produces haploid cells, and it is not a cycle. It is quite similar to mitosis the only difference is the prophase I. Prophase I has 5 sub-stages namely leptotene, zygotene, pachytene, diplotene, and diakinesis.
In leptotene individual chromosomes begin to condense into long strands within the nucleus. In zygotene individual chromosomes begin to condense into long strands within the nucleus.
In pachytene the synapsis of homologous chromosomes takes place. In diplotene chiasmata the regions where crossing-over occurred. In diakinesis four parts of the tetrads are actually visible. metaphase I, anaphase I, telophase I and meiosis II are the similar with mitosis.