Dominant allele and the absence is due to recessive

In chickens, the presence of feathers on the legs is due todominant allele (F) and the absence is due to recessive (f). Apea-shaped comb on the top of the head is controlled by a dominantallele (P) and a single comb by the recessive allele (p). A crossis made between a chicken that is true breeding for feathered legsand a single comb and a chicken that is true breeding for theabsence of leg feathers and pea comb. Only the single-combed,feather legged F2 progeny are saved and these birds are allowed tomate at random. What genotypic and phenotypic ratios are expectedamong the progeny?

P: F/F ; p/p x f/f ; P/P
F1: F/f ; P/p

So, I know the F2 can be F/f ; p/p or F/F ; p/p but how do Igo about finding the ratios?

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