Chapter 7.3, Problem 33AQP

Summary Introduction

To determine:

The phenotype and proportion of the progeny if 1000 progeny are produced by the test cross.

Introduction:

Test cross is the genetic cross between an individual that has the dominant phenotype in specific trait to a homozygous recessive for these specific traits. In Drosophila melanogaster, black body $\left(b\right)$ is recessive to gray body $\left(b^{+}\right)$, purple eyes $\left(pr\right)$ are recessive to red eyes $\left(p{r}^{+}\right)$, and vestigial wings $\left(vg\right)$ are recessive to normal wings $\left(v{g}^{+}\right)$. These three traits are linked. Interference among the genes is given as 0.5. A fly with a black body, purple eyes and vestigial wings is crossed with a fly homozygous for grey body, red eyes and normal wings.