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chapt11_lecture - Sexual Reproduction and Meiosis Chapter...

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Sexual Reproduction and Meiosis Chapter 11
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Sexual life cycle Made up of meiosis and fertilization Diploid cells Somatic cells of adults have 2 sets of chromosomes Haploid cells Gametes have only 1 set of chromosomes Offspring inherit genetic material from 2 parents 2
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4 Life cycles of sexually reproducing organisms involve the alternation of haploid and diploid stages Some life cycles include longer diploid phases, some include longer haploid phases In most animals, diploid state dominates Zygote first undergoes mitosis to produce diploid cells Later in the life cycle, some of these diploid cells undergo meiosis to produce haploid gametes
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6 Features of Meiosis Meiosis includes two rounds of division Meiosis I and meiosis II Each has prophase, metaphase, anaphase, and telophase stages Synapsis During early prophase I Homologous chromosomes become closely associated Includes formation of synaptonemal complexes Formation also called tetrad or bivalents
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8 Crossing over Genetic recombination between nonsister chromatids Allows the homologues to exchange chromosomal material Alleles of genes that were formerly on
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This note was uploaded on 06/06/2011 for the course BIOL 1105 at Virginia Tech.

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chapt11_lecture - Sexual Reproduction and Meiosis Chapter...

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