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chapter_2-2 - Monday,January25,2010 Chapter2,PartII(ofII...

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Monday, January 25, 2010 Chapter 2, Part II (of II) Mendel’s Breakthrough Assignment Chapter 2 problems: 1-5, 7-9, 11-15, 18-20, 22, 23, 26, 29, 33
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Dihybrid cross Dihybrid =  an individual that is  heterozygous for two genes Mendel designed experiments to  determine if two genes segregate  independently For example:  yellow round peas (YY RR)   X                         green wrinkled peas (yy rr)
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Results of Mendel’s dihybrid crosses Therefore, alleles of genes assort independently  and can thus  appear in any combination in the offspring in a predictable  ratio. F2 contained: F2 contained: parental types parental types and and recombinant types recombinant types
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The law of independent assortment - During gamete formation different pairs of  alleles segregate independently 
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Probability applied to dihybrid cross What is the probability that a pea will be green AND  wrinkled?  We need to use the product rule. 
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