You Conduct a Genetic Screen on Peas and Isolate Four

Multiple Choice

You conduct a genetic screen on peas and isolate four mutant strains, each carrying a recessive mutation that causes the production of red peas (instead of the wild-type green peas) .To test whether these mutations are in the same gene, you perform complementation tests between the four different true-breeding strains.The results from these complementation tests are shown in Table 19-33. $\begin{array} { c | c } \text { Strains crossed } & \text { Phenotype of offspring } \\\hline 1 \times 2 & \text { green seeds } \\1 \times 3 & \text { green seeds } \\1 \times 4 & \text { red seeds } \\2 \times 3 & \text { red seeds } \\2 \times 4 & \text { green seeds } \\3 \times 4 & \text { green seeds }\end{array}$ Table 19-33
Given this data, how many genes do these four alleles represent?

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