In a Drosophila Cross,you Mate a Parental Line Displaying Crossed

question 2

Multiple Choice

In a Drosophila cross,you mate a parental line displaying crossed eyes (recessive trait,autosomal) and corkscrew bristles (recessive trait,autosomal) by a wild-type fly.The sites of the two genes are known to be unlinked.The F₁ flies are wild type.

You self the F₁ flies in the hope of regenerating the cross-eyed/corkscrew phenotype.

How many individual F₂ flies would you need to analyze to have 95% confidence of finding at least one cross-eyed/corkscrew fly?

• A)16 flies
• B)8 flies
• C)32 flies
• D)47 flies
• E)216 flies

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