A Drosophila fly heterozygous for alleles for black body, dumpy wings, and purple eyes was test-crossed to a fly that was homozygous recessive for all three genes. The genes are all on the same chromosome. The offspring had the following phenotypes in the following numbers:
$$\begin{array} { | l | c | }
\hline \text { Phenotype } & \text { Number of offspring } \
\hline \text { wild type } & 225 \
\hline \text { black body, purple eyes, dumpy wings } & 238 \
\hline \text { dumpy wings } & 122 \
\hline \text { black body, purple eyes } & 135 \
\hline \text { black body, dumpy wings } & 15 \
\hline \text { purple eyes } & 19 \
\hline \text { purple eyes, dumpy wings } & 6 \
\hline \text { black body } & 5 \
\hline
\end{array}$$ What is the order of the genes on the chromosome?

Question

A Drosophila fly heterozygous for alleles for black body, dumpy wings, and purple eyes was test-crossed to a fly that was homozygous recessive for all three genes. The genes are all on the same chromosome. The offspring had the following phenotypes in the following numbers:
$$\begin{array} { | l | c | } 
\hline \text { Phenotype } & \text { Number of offspring } \
\hline \text { wild type } & 225 \
\hline \text { black body, purple eyes, dumpy wings } & 238 \
\hline \text { dumpy wings } & 122 \
\hline \text { black body, purple eyes } & 135 \
\hline \text { black body, dumpy wings } & 15 \
\hline \text { purple eyes } & 19 \
\hline \text { purple eyes, dumpy wings } & 6 \
\hline \text { black body } & 5 \
\hline
\end{array}$$ What is the order of the genes on the chromosome?

Quizplus · Accepted Answer

The Answer of A Drosophila fly heterozygous for alleles for black body, dumpy wings, and purple eyes was test-crossed to a fly that was homozygous recessive for all three genes. The genes are all on the same chromosome. The offspring had the following phenotypes in the following numbers:
$$\begin{array} { | l | c | } 
\hline \text { Phenotype } & \text { Number of offspring } \
\hline \text { wild type } & 225 \
\hline \text { black body, purple eyes, dumpy wings } & 238 \
\hline \text { dumpy wings } & 122 \
\hline \text { black body, purple eyes } & 135 \
\hline \text { black body, dumpy wings } & 15 \
\hline \text { purple eyes } & 19 \
\hline \text { purple eyes, dumpy wings } & 6 \
\hline \text { black body } & 5 \
\hline
\end{array}$$ What is the order of the genes on the chromosome?

A Drosophila Fly Heterozygous for Alleles for Black Body, Dumpy