If purple (P) is dominant to white (p) and axial (A) is dominant to terminal (a), and in a cross of white, axial to purple, terminal the ratio of offspring is 1/4 white, axial; 1/4 white, terminal; 1/4 purple, axial; 1/4 purple, terminal, then what is the genotype of the parents?

a. Ppaa X PpAa
b. PPaa X ppAA
c. ppAa X PPaa
d. ppAA x Ppaa
e. Ppaa X ppAa

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.