Meiosis.10.OAK - 10 Purves 9.14 Crossing-over and...

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0 NOTE!! These files are provided for the sole purpose of assisting BSci 110 students to study for exams in the class. Some of the material in these files may be copyrighted, and it is not OK for you to share these files with anyone who is not a student in this class or to use them for any purpose other than to study for the exams of our class. Thanks, Carl Johnson
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Human Chromosomes, metaphase spreads 1 Homologous chromosomes : One came from mother The other came from father The homologs have the same genes, but potentially different alleles
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Human Chromosomes, metaphase spreads 2 What is this karyotype?
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Human Life Cycle; Mitosis vs. Meiosis 3 Haploid (1n) Diploid (2n) C&R 13.5
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Stages of Meiosis I: Prophase I 4 Purves 9.14
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Stages of Meiosis I: Prophase I to Metaphase I 5 Purves 9.14
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Stages of Meiosis I: Anaphase I and Telophase I 6 Purves 9.14
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Stages of Meiosis II: Prophase II and Metaphase II 7 Purves 9.14
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Stages of Meiosis II: Anaphase II and Telophase II 8 Purves 9.14
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Stages of Meiosis: End Result 9 Purves 9.14 Four 1n cells
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Prophase I is Particularly Important!
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Unformatted text preview: 10 Purves 9.14 Crossing-over and Recombination 11 Purves 9.16 C&R 13.12 Prophase I nonsister chromatids (a pair of homologs) Anaphase I Anaphase II daughter cells synapsis and crossing-over chiasma Crossing-over and Recombination Occurs During Prophase I 12 Purves 9.15 Chiasmata Meiosis and Mendels Laws 13 Meiosis is a reductive division: (2n) --> (2 X 2n) --> (4 X 1n) Relates to Mendels Law of Segregation: separation of alleles that are reunited by fertilization Mendels Law of Independent Assortment: genes on non-homologous chromosomes assort independently Number of Chromosomes and the Likelihood of Independent Assortment 14 Human diploid karyotype: 46 chromosomes Ophioglossum (a fern) haploid karyotype: 631 chromosomes! Assuming that these two species have the same number of genes, which species would be more likely to demonstrate Independent Assortment between any randomly chosen pair of genes?...
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Meiosis.10.OAK - 10 Purves 9.14 Crossing-over and...

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