Friday, September 27, 2013

Mitosis & Meiosis

Mitosis and meiosis have several similarities and differences. In mitosis, cells divide in four steps. First, they go through prophase. In prophase, the centrioles begin to force out apart from each other toward pivotal poles and the nuclear tissue layer begins to breakup. In metaphase, chromosomes line of merchandiseup at the equator of the cell, k instantern as the metaphase plate. In anaphase, the centromere that connects the chromatids splits and the chromatids separate from one another. The chromatids move toward opposite ends of the cell. In anaphase, the cell also starts to split in two, forming a separate furrow, the area where it pinched apart. In telophase, a nuclear tissue layer forms around each new cell, resulting in two missy cells. The cytoplasm then begins to divide, called cytokinesis. The difference between mitosis and meiosis I is the pairing up of homologous chromosomes in a say to work called synapsis in meiosis I. Because of this, this dra stically changes the processes of meiosis. In prophase I of meiosis, the chromosomes go through synapsis, forming a tetrad. Everything else that happens in prophase happens. In metaphase I, the chromosomes line up at the equator of the cell, and, they stay in their homologous pairs. During anaphase I of meiosis, the centromeres do not divide. Instead, the homologous pairs separate with the entire replicated chromosome contemptible to the opposite poles of the cell.
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In telophase I, the cell undergoes the same processes as telophase in mitosis. But, sort of of 23 homologous pairs of chromosomes, there are now 23 replicated chromosomes. Meiosis II is virtually the same at mitosis, b ut each cell has only 23 replicated chromoso! mes sooner of 46. later on the cells go through telophase II, we are unexpended with four haploid cells. You leave out spindle fibre formation, the differences between lay out and animal division, and crossing over. If you indispensability to get a copious essay, order it on our website: OrderEssay.net

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