You cross a long-finned red guppy with a short-finned green guppy p-generation The F1-generation consists of long-finned green guppies what is the genotypes of the p-generation and the F1-generation?

The dominant traits, as shown by the F1-generation's display of complete dominance, are long fins and green color. The parents must have been:

long-finned red guppy:

FFcc

short-finned green guppy:

ffCC

filial generation: ALL FfCc