With two pairs of genes involved (P/p and Z/z), a testcross (ppzz) with an organism of unknown genotype indicated that the gametes produced were in the following proportions:
a) pz, 42.4%; pz, 6.9%
b) Pz, 42.4%; Pz, 6.9%
c) Pz, 42.4%; pz, 6.9%
d) PZ, 6.9%; pz, 42.4%