Practice Problem 27 Drosophis the genes for witnered wings i

Practice Problem 27 Drosophis, the genes for witnered wings innd0 smooth abdomen (sm and speck body (sp) are located on and are separated by the following map distances wnd 130.5) sno (155-mm sp A female with whered wings and a smoothabdomen was mated to a male with a speck body. The resuting phenotypically wildtype females were mated with males that had the mutant phenotype for althree trats, producing Calculate the number of expected double oossover progeny. Express your answer to the nearest whole number. Submit MLAnswers Give up single-crossover probabiites and then multiply by he total number To calculate the expected number of double crossovers use the product law. Munply the is 0305x0,155 1000 47. Using the map distances provided, the expected number of double crossovers for these genes is 03 Calculate the number of observed double crossover progeny of this problem, assume that interterence Express your answer to the nearest whole number Sub M Answers Give up coincidence (C) sa nato of the observed number of double crossovers dvided by the expected number of such crossovers. can also be determined from the folowing equaton is 3forthese genes, you can plug a3 into this equation and solve for C C. 07 Next plug the value for Cand the expected rumber of double crossovers into the coencent coincidence equaton: observed DCOI expected DCO 0.7 How many offspring are expected to have the following phenotypes withered wings speckbody

Solution

(C)How many offspring are expected to have the following phenotypes?

withered wings & speck body

OR

smooth abdomen

Answer is 272

(D)How many offspring are expected to have the following phenotypes?

withered wings & speck body & smooth abdomen

OR

wild type

Answer is 122

(E)How many offspring are expected to have the following phenotypes?

withered wings & smooth abdomen

OR

speck body

Answer is 573