In Drosophila melanogaster , white eyes ( w) are recessive to red eyes ( w + ),
ID: 321801 • Letter: I
Question
In Drosophila melanogaster, white eyes (w) are recessive to red eyes (w+), and crossveinless wings (cv) are recessive to crossveined wings (cv+). Both genes are known to be on the X chromosome. The following crosses are performed:
P: red-eyed, crossveinless female (w+ cv / w+ cv) X white-eyed, crosseveined male (w cv+ / Y)
F1: All red-eyed and crossveined
A female fly from the F1 generation is crossed with a male with white eyes and crossveinless wings (w cv / Y), producing the following progeny, with equal numbers of male and female flies within each group:
F2: 357 red-eyed and crossveinless
341 white-eyed and crossveined
52 red-eyed, crossveined
45 white-eyed, crossveinless
TOTAL: 795 flies
What was the genotype of the F1 female?
What was the genotype of the F1 female?
Answers: A. w+ cv+ / w cv B. w w+ / cv cv+ C. w cv+ / w+ cvExplanation / Answer
The genotype of F1 female is
A. w+ cv+ / w cv
All the F1 generation are red eyed and crossveined