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Lecture 6-Mitosis and Meiosis

Lecture 6-Mitosis and Meiosis - Lecture 6 Mitosis and...

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Lecture 6- Mitosis and Meiosis -Meiosis produces cells with half the chromosomes; may or may not be gametes -Sexual eukaryotes bring homologous haploid parental genomes into close proximity in a diploid zygote -Recombination during meiosis yields cells with different DNA sequence than carried by either parent -Hapliod cell: 1 basic set of chromosomes (humans have 23); meiosis -Diploid cell: 2 basic sets of chromosomes (zygote) Life Cycles -In animals, the product of meiosis is gametes -Fertilization restores the diploid phase of the life cycle -Animal cells are haploid only as a sperm or an egg (no mitotic division in haploid phase) -In many organisms, the products of meiosis are spores, not gametes. -In plant cells, mitosis occurs in haploid and diploid phases (the spores divide by mitosis) -Plants make gametes by mitosis -Plants make spores by meiosis -In some organisms, the diploid zygote remains uni-cellular while the haploid is multi-cellular (i.e. a spore)
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