In Fruit Flies, Red Eyes (Pr+_) Are Dominant to Purple

question 33

Multiple Choice

In fruit flies, red eyes (pr+_) are dominant to purple eyes (prpr) and normal wings (vg+_) are dominant to vestigial wings (vgvg) . The genes are located on the same chromosome. A pure- breeding red- eyed fly with vestigial wings was crossed with a pure- breeding purple- eyed fly with normal wings. All of the F1 progeny had a WT phenotype. The recombination frequency between the two genes is 15%. If an F1 individual were test crossed, what percentage of the progeny would you expect to have the WT phenotype?

• A) 85%
• B) 50%
• C) 7.5%
• D) 92.5%
• E) 15%

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