handout lecture Meiosis Chapter 10

handout lecture Meiosis Chapter 10 -...

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11/7/11 1 Outline 1 1. Asexual and sexual reproduction. 2. Premeiotic interphase, Meiosis I: Prophase I (synapsis, crossing-over), Metaphase I, Anafase I, Telophase I, Interkinesis. 3. Meiosis II: Prophase II, Metaphase II, Anaphase II, Telophase II 4. Comparison of mitosis and meiosis General Biology 01:119:101‐Fall 2011 Dr. Monica Torres Chapter 10. Meiosis, pp 225-236. Asexual and Sexual Reproduction asexual reproduction sexual reproduction Haploid (n) Cell General Biology 01:119:101‐Fall 2011 Dr. Monica Torres Diploid (2n) Cell General Biology 01:119:101‐Fall 2011 Dr. Monica Torres Duplicated chromosomes unduplicated chromosomes Sexual Life Cycle‐Fusion of Gametes Gametes (n) Zygote (2n) Fig. 10‐16b, p. 229 MEIOSIS PROPHASE I Synapsis of homologous chromosomes to form tetrads ANAPHASE I Homologous chromosomes move to opposite poles PROPHASE II Two n cells with duplicated chromosomes ANAPHASE II Sister chromatids move to opposite poles HAPLOID CELLS Four n cells with unduplicated chromosomes
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11/7/11 2 Stages of Meiosis MEIOSIS I Prophase I Leptotene Zygotene (synapsis, tetrads) Pachytene (crossing over)
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