UMass Amherst BIOLOGY 283 - Homework 3_KEY_2 (10 pages)

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Homework 3_KEY_2



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Homework 3_KEY_2

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Pages:
10
School:
University of Massachusetts Amherst
Course:
Biology 283 - General Genetics
General Genetics Documents

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Homework 3 1 In tomatoes red fruit A is dominant to yellow aa and a tall stem B is dominant to dwarf stems bb A series of matings between dihybrid tomato plants yields the following offspring 557 tall red fruited plants 187 tall yellow fruited plants 192 dwarf red fruited plants 64 dwarf yellow fruited plants Are the fruit color and stem length genes independently assorting Perform a chi square test to support your argument and clearly state the degrees of freedom and interpretation of the p value you obtain Use the chi square table below to obtain your p value Three of the many recessive mutations in Drosophila melanogaster that affect body color wing shape or bristle morphology are black b body versus the dominant WT gray body dumpy wings dp versus dominant long wings in the WT and hooked bristles hk versus dominant straight not hooked bristles in the WT From a cross of a dumpy female with a black hooked male all the F1 progeny were WT for all three characteristics One F1 female was testcrossed with a dumpy black hooked male to give the progeny in the following table NOTE that only the mutant phenotypes are listed If no mutant phenotype is given the phenotype was WT for that trait For example the set described as black have black bodies a mutant phenotype and are WT for the wing and bristle traits WT 169 black 19 black hooked 301 dumpy hooked 21 hooked 8 hooked dumpy black 172 dumpy black 6 dumpy 304 TOTAL PROGENY 1000 a 4 points write the phenotype pairs in the table below Number Phenotype Pair 1 Pair 2 Pair 3 Pair 4 b 4 points What are the parental classes order is not important c 4 points What are the double cross over classes order is not important d 4 points What is the gene order e 4 points Calculate the distance between the leftNmost gene and the middle gene Show your work f 4 points Calculate the distance between the middle gene and the rightNmost gene Show your work In the diagram shown below LOD tests were performed for a marker called 1 that is



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