lecture_10__05 - Meiosis: 1n Meiosis I 2n cell division...

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Meiosis: replication cell division Mom Dad cell division + + Meiosis I Meiosis II homologous chromosomes separate sister chromatids separate 2n 1n • Each cell that enters meiosis generates 4 cells with half of the original genome content • When homologous chromosomes segregate from each other in meiosis I, each chromosome segregates independently
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Meiosis: example with 2 homologous pairs of chromosomes replication Meiosis I (homologous chromosomes separate) or + +
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Meiosis: 2 homologous pairs of chromosomes, continued Meiosis II (sister chromatids separate) or + + + +
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Meiosis: example with 3 homologous pairs replication Meiosis I (homologous chromosomes separate) + + + + or or or
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Meiosis II: example with 3 homologous pairs, continued Meiosis II + + + + Meiosis II Meiosis II Meiosis II
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Homologous chromosomes distribute randomly during meiosis I. This random assortment means that: 2 n different types of gametes are produced from each meiosis, where n = # of homologous chromosome pairs therefore 3 chromosome pairs would yield 2 3 different types of gametes (8) Humans have 23 pairs of chromosomes (including X and Y), therefore there are 2 23 different gametes that could be generated from a single cell in a single meiosis.
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lecture_10__05 - Meiosis: 1n Meiosis I 2n cell division...

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