AP Biology Meiosis Essay

Meiosis is the process in sexually reproducing organisms where cells divide. The cells produced during meiosis have half the chromosome number as the original cell. There are two cell divisions in meiosis, meiosis I and meiosis II. These cell divisions produce 4 haploid daughter cells. Haploid cells contain only one set of chromosomes, which is written as n. Meiosis consists of nine phases. In meiosis the enterprise I the chromosomes replicate and the connectors duplicates in one diploid cell. Diploid cells have two sets of chromosomes, they received one from each parent.

During protease I the nuclear envelope fragments and spindle misconstrues form between the compresses. Homologous chromosomes pair to make two sister chromatics. This is called synapses. Chromatics of homologous pairs exchange segments when they cross over. At metastases l, the pairs line up on the metastases plate. Misconstrues from one pole attach to the eigenvector of one homologous chromosome, while misconstrues from the other pole attach to the eigenvector of the other pair. During anapest I the misconstrues get shorter pulling the homologous pairs towards opposite poles.

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At telephone I two haploid cells form but the chromosomes are still double. Meiosis II separates the sister chromatics. During protease II the sister chromatics in each cell begin moving towards the equator. At metastases II the chromosomes align on the metastases plate in each cell. The process of anapest II pulls the sister chromosomes to opposite poles in each cell. During telephone II each cell torts a nuclei and cytokines splits the cells apart Of genetically different haploid cells are produced. Independent assortment is differences between the genes.

Variation can occur n meiosis when the chromosomes cross over and during random fertilization. Random fertilization is when a gamete from the mother unites with the haploid from the father to produce a diploid zygote. The gamete from the mother is one of 8 million and the gamete from the father is one of 8 million. Independent assortment occurs during protease II of meiosis l. The Law of Segregation is Mender’s first law, which states that allele pairs separate during gamete formation, and then randomly re-form as pairs during the fusion of gametes at fertilization. This occurs during anapest I.

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