A bacterium of genotype a⁺b⁺c⁺d⁺ is the donor in a cotransformation mapping. The recipient is a^-b^-c^-d^-. Data from the transformed cells (genotype and percent of each cotransformant) are shown below. What is the order of the genes? $\begin{array} { l c } \text { Genotype } & \text { Cotransformants } \\a ^ { + } \text {and } b ^ { + } & 2 \% \\a ^ { + } \text {and } c ^ { + } & 0 \% \\a ^ { + } \text {and } d ^ { + } & 5 \% \\b ^ { + } \text {and } c ^ { + } & 5 \% \\b ^ { + } \text {and } a ^ { + } & 0 \% \\c ^ { + } \text {and } d ^ { + } & 0 \%\end{array}$

Question

A bacterium of genotype a⁺b⁺c⁺d⁺ is the donor in a cotransformation mapping. The recipient is a^-b^-c^-d^-. Data from the transformed cells (genotype and percent of each cotransformant) are shown below. What is the order of the genes?

\begin{array} { l c } \text { Genotype } & \text { Cotransformants } \\a ^ { + } \text {and } b ^ { + } & 2 \% \\a ^ { + } \text {and } c ^ { + } & 0 \% \\a ^ { + } \text {and } d ^ { + } & 5 \% \\b ^ { + } \text {and } c ^ { + } & 5 \% \\b ^ { + } \text {and } a ^ { + } & 0 \% \\c ^ { + } \text {and } d ^ { + } & 0 \%\end{array}