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ch10_lecture-Meiosis

ch10_lecture-Meiosis - Meiosis Chapter 10 Sexual...

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Meiosis Chapter 10
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Sexual Reproduction Chromosomes are duplicated in germ cells Germ cells undergo meiosis and cytoplasmic division Cellular descendents of germ cells become gametes Gametes meet at fertilization
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Asexual Reproduction Single parent produces offspring All offspring are genetically identical to one another and to parent
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Sexual Reproduction Involves Meiosis Gamete production Fertilization Produces genetic variation among offspring
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Homologous Chromosomes Carry Different Alleles Cell has two of each chromosome One chromosome in each pair from mother, other from father Paternal and maternal chromosomes carry different alleles
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Sexual Reproduction Shuffles Alleles Through sexual reproduction, offspring inherit new combinations of alleles, which leads to variations in traits This variation in traits is the basis for evolutionary change
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Gamete Formation Gametes are sex cells (sperm, eggs) Arise from germ cells testes ovaries anther ovary Figure 10.2a Page 164
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Chromosome Number Sum total of chromosomes in a cell Germ cells are diploid (2 n ) Gametes are haploid ( n ) Meiosis halves chromosome number
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Meiosis: Two Divisions Two consecutive nuclear divisions Meiosis I Meiosis II DNA is not duplicated between divisions Four haploid nuclei form
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Meiosis I Each homologue in the cell pairs with its partner, then the partners separate In-text figure Page 165
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