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2. Ch4_Ch_2_-_probabilities_Sept_23_corrected

2. Ch4_Ch_2_-_probabilities_Sept_23_corrected - &More...

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9/29/09 1 Alleles – different versions of a gene Different traits of same character ( e.g., hair colour = character; red & brown) If genes encode proteins Then alleles encode slightly different proteins Proteins produced by some alleles funcCon beDer than others; some alleles may produce completely non‐funcConal proteins Do alleles for the same gene (thus on homologs) interact with each other? Alleles do NOT interact; however, the products of alleles Chapter 2 – Mendelian GeneCcs & More! DNA protein organismal traits Expression of Genes
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9/29/09 2 There are 40 different alleles for an enzyme involved in liver metabolism. What is the maximum number of alleles that 1 individual can have? A. 1 B. 2 C. 20 D. 40 E. 80 Not posted Transmission of alleles What if there are 10 alleles for eye colour in a populaCon? What’s the maximum # of alleles an individual can have for eye colour? What are the gametes this individual could produce? Individual heterozygous at 1 gene (locus) Brown eyes Green eyes Principle of Segrega/on
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9/29/09 3 Chromosome got from dad Chromosome got from mom A 1 A 2 When do the 2 alleles segregate from 1 another? Principle of SegregaCon Transmission of alleles & probability ProbabiliCes – predicted on scale of 0 to 1
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