MCB 10-3 - Molecular and Cellular Biology 10 What role do...

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April 5 th , 2010 Molecular and Cellular Biology 10 What role do genes play in human reproduction? I. Chromosomes a. Number of chromosomes is characteristic of each species i. Humans have 46 chromosomes b. Diploid number (2N) i. Number of chromosomes ii. Humans have 44 autosomes + 2 sex chromosomes II. Mitosis of somatic (body) cells a. Replication of cell during S phase i. Double the DNA III. Meiosis of germline (sex) cells a. Diploid Meiosis I (2 Daughter cells) Meiosis II 4 Haploid cells b. Diploid cell undergoes Meiosis I to reduce the number of chromosomes creating two daughter cells. The daughter cells undergo Meiosis II, reducing the number of chromatids (sister chromatids separate), creating 4 haploid cells. c. Only happens in Meiosis: i. DNA Exchange (crossing over) only occurs in prophase of Meiosis I ii. Recombination iii. Genetic linkage (one tool used to map chromosomes) IV. Mitosis and Meiosis a. Interphase b. Mitosis i. Prophase ii. Anaphase iii. Metaphase
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MCB 10-3 - Molecular and Cellular Biology 10 What role do...

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