UT BIO 325L - Homework6[KEY]Spring14 (3 pages)

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Homework6[KEY]Spring14



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Homework6[KEY]Spring14

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Pages:
3
School:
University of Texas at Austin
Course:
Bio 325l - Laboratory Experience in Genetics

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Name Lab room day time TA name Patterns of inheritance While you are armed with some information regarding the genes your fly lines may have actual data often will need you to work backwards from results rather than reasoning forward from known qualities of the genes as you have been for the previous homework assignments The data will also not be in perfectly neat ratios An example of data is given on the table below Use the values here to answer questions 1 3 RECORD OF DATA FOR F1 PROGENY Sex Phenotype Quantity Female curled wings wild type eyes 46 Male curled wings wild type eyes 39 RECORD OF DATA FOR F2 PROGENY Sex Female Male Phenotype Quantity wild type wings wild type eyes 132 curled wings wild type eyes 263 curled wings brown eyes 117 wild type wings wild type eyes 129 curled wings wild type eyes 271 curled wings brown eyes 112 1 Before panicking about all the numbers and categories stop and think about what simple information you can infer from the observable phenotypes a 0 5 First looking at all of the phenotypes in both the F1 and F2 data sets what mutations appear to be present The mutations are in the wing and eye one causing curled wings and one causing brown eyes These can all be seen in the F2 generation b 1 Second what does just the F1 generation tell you about those mutations think back on previous homework Explain your reasoning The F1 tells us that the curly wing mutation is dominant because it is showing up in the F1 heterozygous offspring On the other hand the brown eye mutation appears to be masked since it only shows up again in the F2 the P generation presumably had one parent with brown eyes That means the brown eye mutation is recessive c 1 Finally what are the estimated ratios for the phenotypes seen in the F2 This can be eyeballed or can be calculated By dividing all of the scored counts in the F2 by the lowest value that category is set to a relative value of 1 Note this won t always work well particularly in strange cases where the



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