Wild-Type Pea Flowers Are Purple A) 1
B) 2
C) 3
D) 4
E) 5

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