Wright BIO 2110 - BIO2110_exam2_fall2015 (14 pages)

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BIO2110_exam2_fall2015



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BIO2110_exam2_fall2015

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Pages:
14
School:
Wright State University
Course:
Bio 2110 - Principles of Molecular and Classical Genetics

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Name BIO 2110 Genetics Exam 2 6 November 2015 calculators permitted see last page for potentially useless formulae Name Name 1 In a field of red flowers you find three different patches of white flowers You name the mutations that give these white flower m1 m2 and m3 These mutations all are recessive Explain the results of crosses 1 and 2 shown below Predict the results for cross 3 Explain the reason for your prediction Cross 1 P0 white m1 m1 x white m2 m2 F1 all red Cross 2 P0 white m1 m1 x white m3 m3 F1 all white Cross 3 P0 white m2 m2 x F1 white m3 m3 Name 2 In C elegans mutations in the him 8 gene result in defects in the pairing synapsis of X chromosomes As a result of these pairing defects him 8 mutants exhibit high rates of X chromosome nondisjunction i In what stage of meiosis would pairing defects first be observed ii What impact if any would these pairing defects have on meiotic recombination iii In which meiotic division would nondisjunction be observed Provide a concise brief explanation for your answer Name 3 Most loss of functions mutations mutations that disrupt gene function are recessive Provide a brief explanation for this observation Name 4 Below is shown a cis dyhybrid cross involving the dumpy wing and short legs genes of Drosophila melanogaster Both of these genes are on chromosome II Derive a map function to express the expected frequency of the Long Wing Short Leg phenotype in the F2 generation in terms of the recombination frequency p between these genes Note that in Drosophila melanogaster males there is no meiotic recombination P0 Dumpy Wings Short Legs x Long Wings Long Legs F1 Long Wings Long Legs x F2 Longs Wings Long Legs Long Wings Short Legs Dumpy Wings Long Legs Dumpy Wings Short Legs Long Wings Long Legs Name 5 In pitcher plants allelic variation in a single gene regulates whether the plant has sticky or slippery leaves and allelic variation in a different gene regulates whether the plant secretes acid or base Are the data



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