In Fruit Flies,the Recessive Pr and Cn Mutations Cause Brown

question 39

Multiple Choice

In fruit flies,the recessive pr and cn mutations cause brown and bright-red eyes,respectively (wild-type flies have brick-red eyes) .The double mutant pr cn combination has orange eyes.A female who has wild-type eyes is crossed to an orange-eyed male.Their progeny have the following distribution of eye colours: $$\begin{array} { | l | r | } \hline \text { wild-type } & 8 \\\hline \text { brown } & 241 \\\hline \text { bright-red } & 239 \\\hline \text { orange } & 12 \\\hline & 500 \\\hline\end{array}$$
Which classes are the parental types?

• A) wild-type and orange
• B) brown and bright-red
• C) wild-type and brown
• D) bright-red and orange
• E) There is no way to determine this.

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