LS4 Lect_2

LS4 Lect_2 - Chromosomes - rst reported 1882 (after Mendel)...

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Chromosomes - frst reported 1882 (aFter Mendel) # chromosomes/nucleus in a species is constant. human, 46; corn, 10; Fruit ±y, 8 2 pairs oF arms - members oF a pair are equal in size longitudinal - 2 identical units, called chromatids Humans somatic germline 8 chromosomes 4 pairs In the fruit Fy chromosomes exist in identical pairs. Members of the same pair are called homologues. cells with 2 copies of each chromosome are diploid (2n) cells with 1 copy of each chromosome are haploid (1n) Chromosomes exist in pairs Genes exist in pairs. 2 MITOSIS - somatic reproduction cell cycle: Mitotic cycle: 1. Interphase - (G1 + S + G2) longest duration, duplication 2. Prophase - condensation oF chromosomes chromosomes appear double - 2 chromatids/1 centromere 3. Metaphase - chromosomes Fully condensed, aligned at metaphase plate, spindle Formation, single centromere 4. Anaphase - centromere split, sister chromatids become daughter chromatids, chromosomes proceed to poles. 5. Telophase - cytokinesis, chromosomes decondense, nuclear
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This note was uploaded on 04/15/2010 for the course LS LS 4 taught by Professor Ribaya during the Winter '07 term at UCLA.

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LS4 Lect_2 - Chromosomes - rst reported 1882 (after Mendel)...

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