Practice_Genetics_Quiz

Practice_Genetics_Quiz - Practice Quiz—Genetics Lab ...

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Unformatted text preview: Practice Quiz—Genetics Lab 2Suppose you identified two new mutations in fruit flies (Drosophila melanogaster). One mutation, ‘wavy’ wings, results in wings with an undulating outer edge, whereas the wing margins of wildtype flies are smooth. A second mutation, ‘stubby’ bristles, shows short, thick body hairs, whereas the hairs of wildtype flies are long and thin. Let’s also say that you were able to culture true ­breeding populations of both mutations and then you tested the inheritance of each by performing a set of reciprocal crosses with true ­breeding flies. Below are the F1 and F2 progeny of these crosses: F1 Offspring Counts Smooth & Long Smooth & Stubby Wavy & Long Wavy & Stubby M/F M/F M/F M/F Total Wavy & long males × smooth & stubby females 0 180*/175 0 0 355 Smooth & stubby males × wavy & long females 0 144/150 0 0 294 Parental Crosses Same Parental Crosses F2 Offspring Counts Smooth & Long Smooth & Stubby Wavy & Long Wavy & Stubby M/F M/F M/F M/F Total Wavy & long males × smooth & stubby females 15/18 63/72 3/5 5/2 183 Smooth & stubby males × wavy & long females 36/55 110/113 1/3† 2/4 324 By what mode (chromosome type & dominance) are ‘wavy’ wings inherited? B. By what mode (chromosome type & dominance) are ‘stubby’ bristles inherited? Calculate the chi ­square test statistic (χ Stat) that would be appropriate for testing whether you can safely reject the idea that these traits are independent (unlinked). D. Determine the appropriate chi ­square critical value (χ E. What is the p ­range for a Type 1 error from this test? F. Are the two traits linked? G. A. C. Using the appropriate Drosophila notation, write the genotype of F1 males marked with “*” in the table above. Be careful in your notation to eliminate ambiguity with regard to dominance and linkage. H. Using the appropriate Drosophila notation, write the genotype of F2 females marked with “†” in the table above. Be careful in your notation to eliminate ambiguity with regard to dominance and linkage. 2 2 Crit) for this test. ...
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