L03 chapter 2-2

L03 chapter 2-2 - Genetics Bio 2306.04 Ch 2-2: Cellular...

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1 Genetics Bio 2306.04 Ch 2-2: Cellular Reproduction Meiosis & Gemetogenesis
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2 Sexual reproduction and  genetic variation Mitosis produces only genetically  identical progeny. Shuffling the genetic information by  meiosis -> increase the genetic  variation. Sexual reproduction: Meiosis and  Fertilization
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3 Two Divisions Reduction Division -  chromosome number  reduced by half Equational Division –  similar to mitotic  division
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4 I.  Stages of Meiosis A.  Interphase (as in mitosis) cell growth and development G1, S, and G2 stages S = DNA synthesis
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8 Summary of Prophase I chromosomes contract homologous chromosomes pair synapsis crossing over  nuclear membrane breaks down spindle forms 
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15    Results of Meiosis 1 cell divides into 4 Chromosome number  reduced by half Resulting cells are  genetically variable Figure 2.16
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16 A.  Crossing Over B.  Random distribution of chromosomes   Genetic Variation in Meiosis
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17 A.  Crossing Over Prophase I Genetic information exchanged between  nonsister chromatids   Genetic Variation in Meiosis
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Crossing over produces genetic  variation
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19 B.  Random distribution of chromosomes Line up randomly during Metaphase I Separate in Anaphase I  Genetic Variation in Meiosis
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21 How many different gametes  are  produced? 2 n  types of gametes with n pairs of  chromosomes With 3 pairs: 2 3  = 8 With 4 pairs: 2 4  = 16 With 5 pairs: 2 5  = 32 With 23 pairs: 2 23  = 8,388,608 NOTE: does not take into account crossing over
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22 Characteristic Mitosis Meiosis I Meiosis II Metaphase Events
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This note was uploaded on 04/29/2008 for the course BIO 2306 taught by Professor Durhkopf during the Spring '08 term at Baylor.

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L03 chapter 2-2 - Genetics Bio 2306.04 Ch 2-2: Cellular...

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