The genotype for the F1 generation is PURPLE PETALS. In cross breeding, the offspring of the original generation in a cross are called F1 generation. When two breeding of a particular living organisms are crossed, then the F1 generation will be all the same.<span />
All of the offspring will be heterozygous, meaning they'll have both a P and p allele (Pp), and all will display the dominant allele, P, meaning they will all have purple petals.
The phenotype for the F1 generation, therefore, is purple petals