How does meiosis contribute to human genetic diversity - Essay Example

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Genetic variability among humans is essential for survival. Reproduction plays a significant role to create genetic variability in the offspring. This genetic variability helps to cope up human beings to changing environment and therefore for evolution…
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How does meiosis contribute to human genetic diversity
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"How does meiosis contribute to human genetic diversity"

Genetic variability among humans is essential for survival. Reproduction plays a significant role to create genetic variability in the offspring. This genetic variability helps to cope up human beings to changing environment and therefore for evolution.There are three major sources of such variations, namely, the independent assortment of chromosomes during meiosis, reciprocal recombination of the linked genes on chromosomes by crossing over in prophase I of meiosis, and random fertilization of gametes, thereby raising possibility of innumerable combinations. Sexual reproduction usually comprises of genetic contributions from the two parental organisms. The key to sexual reproduction in eukaryotic human cell is meiosis.The word meiosis comes from the Greek word meaning "to diminish", and that is what meiosis does: it reduces the number of chromosomes by half, that is, if a cell contains 23 pairs of chromosomes before meiosis, after meiosis, the number of chromosomes reduces to 23.During meiosis, a diploid cell (containing 2n number of chromosomes found in the body cells) undergoes two specialized cell divisions, meiosis I and meiosis II, to produce four haploid (containing n number of chromosomes) daughter cells.Meiosis I consists of four stages, prophase I, metaphase I, anaphase I, and telophase I. During prophase I, chromosomes thicken and condense. Homologous or similar chromosomes come together in pairs, and chiasmata occur as chromatids of homologues exchange parts. Read More
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