Meiosis. Before meiosis can happen, the DNA Must replicate, this is done in the stage of interphase. Following interphase the first stage of meiosis occur
Meiosis essay
Meiosis is a reduction division which occurs in sexually reproducing organisms to produce gametes. It involves one division of the chromosomes followed by two divisions of the nucleus and cell. The diploid parent cell gives rise to four haploid daughter cells.
Before meiosis can happen, the DNA Must replicate, this is done in the stage of interphase. Following interphase the first stage of meiosis occur, this is the reduction division and starts with prophase I. In early prophase I centrioles are at their respective poles and their spindle fibres start to grow. The chromosomes become more visible with a beaded appearance due to the centromeres. The chromosomes become more visible by coiling up and condensing. In mid prophase I the nucleolus had gone ant the chromosomes, which consist of two identical chromatids, come together in their bivalents. A bivalent is a pair of homologous chromosomes. Next in late prophase I the nuclear envelope disintegrates so the spindle fibres can attach to the centromeres. The chromosomes can now be seen as two chromatids. In this stage adjacent non-sister chromatids can cross over at the point of chiasma and exchange part of their genetic material.