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: $\begin{array} { l l r } Sex&Phenotype& Number\\\text { male } & \text { wild } & 96 \\ \text { male } & \text { yellow } & 99 \\ \text { female } & \text { wild } & 197 \end{array}$ 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} { l l r } Sex&Phenotype& Number\\\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: $\begin{array} { l l r } Sex&Phenotype& Number\\text { male } & \text { wild } & 96 \ \text { male } & \text { yellow } & 99 \ \text { female } & \text { wild } & 197 \end{array}$ 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