2.3 Meiosis and Genetics

2.3 Meiosis and Genetics - Meiosis: Two Divisions...

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Meiosis: Two Divisions Homologous chromosomes Identical in size, shape and gene sequence Receive one from each parent Two consecutive nuclear divisions Meiosis I Meiosis II DNA is NOT duplicated between divisions Four haploid nuclei are formed
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Meiosis I Stages : Prophase I, metaphase I, anaphase I, telophase I
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Crossing Over Synapses occurs Each chromosome lines up with homologous chromosome Non-sister chromatids exchange segments Results Four chromosomes each with unique genetics Two like each parent Two with genetic information from each parent
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Metaphase I Chromosomes align along equator Random distribution of chromosomes into daughter cells
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Meiosis II Stages: Prophase II, Metaphase II, Anaphase II and Telophase II The two sister chromatids of each duplicated chromosome are separated from each other
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Mitosis Functions Growth, repair Cell replacement Occurs in somatic cells Produces identical
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2.3 Meiosis and Genetics - Meiosis: Two Divisions...

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