In Drosophila, the Autosomal Recessive Pr and Cn Mutations Cause

question 53

Multiple Choice

In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes) .Flies who are homozygous recessive at both pr and cn have orange eyes.A female who has wild-type eyes is crossed to an orange-eyed male.Their progeny have the following distribution of eye colors:
$$\begin{array} { | l | r | } \hline \text { wild-type } & \text { 8 } \\\hline \text { brown } & 241 \\\hline \text { briphit-red } & 239 \\\hline \text { orarnge } & \underline{12} \\\hline & 500 \\\hline\end{array}$$
-Which phenotypes are parental?

• 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.

---

Definitions:

Population

The entire group of individuals or entities considered for statistical or scientific study or analysis.

Group Being Studied

The specific collection of subjects or participants who are observed or experimented on in a research study.

Naturalistic Observation

Naturalistic Observation is a research method in which subjects are observed in their natural environment without any manipulation by the researcher.

Exact Descriptions

Involves providing detailed and precise details or accounts of something.