Working in the famous "fly room" at columbia university, you cross a homozygous recessive purple-eyed, vestigial-winged fruit fly (ppvv) with a heterozygous normal-eyed, normal-winged fly (ppvv). both genes are found on chromosome 2. you discover the following percentages of flies in the f1generation: 42 percent with normal eyes and normal wings; 46 percent with purple eyes and vestigial wings; 6 percent with normal eyes and vestigial wings; and 6 percent with purple eyes and normal wings. a) what is the expected outcome for a cross involving two linked genes? why do you think your results differed from the expected outcome? b) which of the offspring are recombinant types? c) determine the recombination frequency for this cross. d) based on your findings, how many map units apart are the genes for eye colour and wing type on chromosome 2?