Wild-type pea flowers are purple.You find spontaneous,white-flowered mutants growing nearby in five different locations (numbered a-e).You establish pure breeding lines of each and perform crosses between them,and record the F₁ phenotype in the table below.Based on the data in the table,how many different genes in the pathway for purple flowers have been identified by mutation?

\begin{array} { | l | l | l | l | l | l | } \hline & \text { a } & \text { b } & \text { c } & \text { d } & \text { e } \\\hline \text { a } & \text { white } & \text { purple } & \text { purple } & \text { white } & \text { purple } \\\hline \text { b } & \text { purple } & \text { white } & \text { purple } & \text { purple } & \text { purple } \\\hline \text { c } & \text { purple } & \text { purple } & \text { white } & \text { purple } & \text { white } \\\hline \text { d } & \text { white } & \text { purple } & \text { purple } & \text { white } & \text { purple } \\\hline \text { e } & \text { purple } & \text { purple } & \text { white } & \text { purple } & \text { white } \\\hline\end{array}

A) 1
B) 2
C) 3
D) 4
E) 5

In the Common Daisy,the Genes a and a and B

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