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Mature sperm and eggs are haploid cells (1N) that have half the normal number of chromosomes. After photographing the metaphase chromosomes, the individual chromosome images are cut out and matched up by homologous pairs. The process of meiosis II, which ends up with four daughter cells is the short duration process in which the crossing over of chromosomes doesnt happen and furthermore, the sister chromatids are separated in this process. During the meiotic prophase, bivalents are formed and the genetic composition is mixed at points known as the chiasma. This is a photographic record of an individuals chromosomes. Any cell that has two sets of chromosomes is said to be a diploid cell. This will be covered in a later lesson. The frequency of some of these abnormalities is shown in the next slide. Chiasma is the contacts point where to homologous chromosomes form a physical connection or a crossing over.
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Chiasma (Genetics) an overview ScienceDirect Topics. Figure 01: Bivalent The formation of management and Leadership: Nike bivalents will ensure that the genetic composition is mixed between the gamete cells. This cell division process commences with one cell and ends with two cell where the number of chromosomes also reduced to the half. The number of chiasma in the bivalent gives an idea of the cross over the efficiency of the DNA during meiosis. The segregation of homologous pairs of chromosomes at the 1st division is dependent on their previous pairing, synapsis and recombination from crossingove.