If you set up a cross between the female and male flies which of the following represents the phenotypic class of offspring resulting from a single crossover event

If you set up a cross between the female and male flies which of the following represents the phenotypic class of offspring resulting from a single crossover event
InDrosophila the genes for eye color wing shape and wing length are located on chromosome II. Purple eyes (pr) arc bent wings (a) and vestigial wings (vg) are the mutant forms of the wild type traits red eyes straight wings and long wings respectively.You’ve discovered some data in your genetics laboratory which indicates that the distance betweenvgandpris 12.5 m.u. the distance betweenaandpris 44.7 m.u. and the distance betweenaandvgis 32.2 m.u.
Part A
From this information deduce the order of these genes on chromosome II and identify which gene is in the middle.
Part B
You begin studying heterozygous females (a pr vg/+ + +) and homozygous recessive males as part of your thesis project. Based on the information from Part A if you set up a cross between the female and male flies which of the following represents the phenotypic class of offspring resulting from a single crossover event betweenprandvg?
If a total of 1250 offspring were obtained from your cross determine the number of offspring that you would expect to obtain that represent a single crossover event betweenprandvgif interference does not occur.
Part D
Upon careful examination of the offspring obtained from your cross it was determined that only 25 offspring were double crossover phenotype — half of the 50 that was expected.Now how many offspring that represent a single crossover event betweenprandvgare expected considering that positive interference has occurred?

 
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