A cross was made between homozygous wild-type female Drosophila and yellow-bodied male Drosophila.All of the resulting offspring were phenotypically wild type.Offspring of the F₂ generation had the following phenotypes:
$\begin{array}{lcc}
\text { Sex } & \text { Phenotype } & \text { Number } \
\hline\
\text { male } & \text { wild } & 96 \
\text { male } & \text { yellow } & 99 \
\text { female } & \text { wild } & 197
\end{array}$ Based on this information:
a) Is the mutant gene for yellow body behaving as a recessive or dominant?
b) Is the yellow locus on an autosome or on the X chromosome?

Question

A cross was made between homozygous wild-type female Drosophila and yellow-bodied male Drosophila.All of the resulting offspring were phenotypically wild type.Offspring of the F₂ generation had the following phenotypes:
 $\begin{array}{lcc}
 \text { Sex } & \text { Phenotype } & \text { Number } \
\hline\
\text { male } & \text { wild } & 96 \
\text { male } & \text { yellow } & 99 \
\text { female } & \text { wild } & 197
\end{array}$ Based on this information:
a) Is the mutant gene for yellow body behaving as a recessive or dominant?
b) Is the yellow locus on an autosome or on the X chromosome?

Quizplus · Accepted Answer

The Answer of A cross was made between homozygous wild-type female Drosophila and yellow-bodied male Drosophila.All of the resulting offspring were phenotypically wild type.Offspring of the F₂ generation had the following phenotypes:
 $\begin{array}{lcc}
 \text { Sex } & \text { Phenotype } & \text { Number } \
\hline\
\text { male } & \text { wild } & 96 \
\text { male } & \text { yellow } & 99 \
\text { female } & \text { wild } & 197
\end{array}$ Based on this information:
a) Is the mutant gene for yellow body behaving as a recessive or dominant?
b) Is the yellow locus on an autosome or on the X chromosome?

A Cross Was Made Between Homozygous Wild-Type Female Drosophila and Yellow-Bodied