11 Meiosis - Meiosis Sexual cell division Adults produce...

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Meiosis Sexual cell division Adults produce gametes called sperm and eggs Only happens in sex cells The egg and sperm have ½ of the original chromosomes, i.e., 23 in our case and are haploid When the 23 chromosomes from each parent fuse together during fertilization, the zygote gets the diploid number of 46 chromosomes
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Discovery of Meiosis Meiosis was first observed by the Belgian cytologist Pierre-Joseph van Beneden in 1887 Gametes (eggs and sperm) contain half the complement of chromosomes found in other cells The fusion of gametes is called fertilization or syngamy It creates the zygote , which contains two copies of each chromosome
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Contains two sets of chromosomes Sexual reproduction Involves the alternation of meiosis and fertilization Asexual reproduction Does not involve fertilization Contain one set of chromosomes
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The Sexual Life Cycle The life cycles of all sexually-reproducing organisms follows the same basic pattern Haploid cells or organisms alternate with diploid cells or organisms There are three basic types of sexual life cycles
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Three types of sexual life cycles
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11 Meiosis - Meiosis Sexual cell division Adults produce...

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