Question

In Drosophila melanogaster, the genes for purple eyes (pr) and curved wings (c) are on the same chromosome. The recombination frequency between pr and c is roughly 20%. Both the purple eyed and curly winged phenotypes are recessive to the wild-type (+) phenotypes (red-eyed and straight winged, respectively).

Consider a cross between a female with genotype (+ c)/(pr +) and a male (pr c)/(pr c). Based on the information above, predict the percentage of offspring of each phenotype from this cross assuming a large number of offspring.

-Wild type (red eyes and straight wings)

-Purple eyes and Straight wings

-Red eyes and Curved wings

-Purple eyes and Curved wings

Answer 1

wILD tYPE - 10%
Purple/ Straight - 40%
Red/Curved - 40%
Purple/Curved - 10%

The recombinant genes stand for 20%, hence the 10-10 split.

Answer 2

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