A Mapping Study Was Done with the E What Is the MOST Probable Order for the Four Genes

Multiple Choice

A mapping study was done with the E. coli genes cheA, cheB, eda, and supD using P1 generalized transduction. The frequency of cotransduction was determined for pairs of genes as shown below. $$\begin{array} { l c } \text { Markers } & \% \text { Cotransduction } \\\text { che A-eda } & 15 \\\text { cheA-supD } & 5 \\\text { cheB-eda } & 28 \\\text { cheB- } \sup D & 2.7 \\\text { eda-sup } & 0\end{array}$$ What is the MOST probable order for the four genes?

A) cheA-supD-eda-cheB
B) cheA-eda-cheB-supD
C) supD-cheA-eda-cheB
D) supD-cheA-cheB-eda
E) cheB-cheA-eda-supD