Lecture - Meiosis

Lecture - Meiosis - Meiosis Sexual Reproduction Chromosomes...

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Meiosis
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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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Question 2 2. Sexual reproduction involves three (3) processes, identify them.
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Fertilization http://www.wappingersschools.org/RCK/staff/teacherhp/johnson/visualvocab/page4.html
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Fertilization Video http://www.youtube.com/watch?v=t_eNmc_gH
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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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Sister Chromatids Prior to “S” of interphase, each chromosome consists of a single “chromatid”. A pair of sister chromatids http://www.vcbio.science.ru.nl/eng/virtuallessons/cellcycle/chromosome/
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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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Variation in Offspring http://www.seapix.com/jagphoto/ladybugs.htm
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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 Video http://www.youtube.com/watch?v=D1_-mQS_F
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Each homologue in the cell pairs with its partner, then the partners separate In-text figure Page 165
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This note was uploaded on 01/13/2012 for the course IS 3020 taught by Professor Staff during the Spring '08 term at Kennesaw.

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Lecture - Meiosis - Meiosis Sexual Reproduction Chromosomes...

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