CHAPTER 12 MEIOSIS

CHAPTER 12 MEIOSIS - CHAPTER 12 MEIOSIS A Intro 1 Gametes...

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CHAPTER 12: MEIOSIS A. Intro 1. Gametes: eggs and sperm (contain 2 chromosomes) 2. Somatic cells: nonreproductive cells (contain 4 chromosomes) 3. Zygote: a single cell produced from the fusion of gametes a) Contains 2 copies of each chromosome 4. Fertilization (syngamy): the fusion of gametes to form a new cell 5. Meiosis: the mechanism in gamete formation that reduces the number of chromosomes to half the number found in other cells I. Meiosis A. Mitosis vs. Meiosis 1. Prophase I of Meiosis- homologous chromosomes find each other and become closely associated, called synapsis 2. Behavior of homologous are dependent upon each other 3. Homologous, not sister chromatids, move to opposite poles 4. Crossing over: in prophase I of meiosis, a genetic recombination that allows the homologues to exchange chromosomal material 5. Meiosis involves two successive divisions with no replication of genetic material between them 6. The second meiotic division is like mitosis except that it is not preceded by
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This note was uploaded on 04/17/2008 for the course BIOL 001 taught by Professor Noel during the Spring '08 term at Marquette.

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CHAPTER 12 MEIOSIS - CHAPTER 12 MEIOSIS A Intro 1 Gametes...

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