Lecture 12 - Fig 3.6-chromosomes come in pairs each pair is...

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UNIT 2 - Segregation Analysis & Mapping Lecture 12- The Chromosomal Theory of Inheritance Chromosome Chromosome number, n Key words Meiosis Haploid/Diploid Homolog/sister chromosome Crossing-over Suggested Problems Pg. 69 - S1, C2, C3, C8, C11 Pg. 127 - S1A Key Figures 3.16 3.17 5.1 5.2
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Review: Mendel & Modifications Mendel 1: Genes in pairs of alleles Multiple alleles of a gene Multiple genes control phenotype -  One gene can control >1 phenotype Mendel 2: One allele is dominant to the other Co- or Partial Dominance Mendel 3: The alleles of a gene segregate into the gametes with equal frequency -Lethal alleles (No all gametes are equally fit) Mendel 4: Alleles of different genes segregate independently of each other-independent  assortment
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Fish cell human chromosomes Chromosomes = ‘colored bodies’
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Unformatted text preview: Fig 3.6-chromosomes come in pairs each pair is different from others Cells of the body somatic cells 2n gametes n Haploid = cells with a single set of chromosomes (n) Diploid = cells with two sets of chromosomes (2n) e.g 46 (23 pairs) in human e.g.human egg has 23 (1 of each pair) Different organisms have different number of chromosomes: Drosophila melanogaster 8 (4 pairs) Gold fish 94 (47 pairs) Dogs 78 (39 pairs) Wheat 28 (14 pairs) Human 46 (23 pairs) = 2n diploid Yeast has 16 or 32 Homologs vs. Sisters Homologs; One from each parent Sisters; Result from duplication 4n 4n Mitosis overview 2n 2n 2n 4n Meiosis overview (Identical) (Not Identical) MI - Homologs segregate Sisters segregate MII -Sisters segregate...
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This note was uploaded on 05/25/2008 for the course MCDB 2150 taught by Professor Winey,mark during the Winter '06 term at Colorado.

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Lecture 12 - Fig 3.6-chromosomes come in pairs each pair is...

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