Need help on bio assignment please!!!?

The shape of radishes is governed by a single locus. At this locus, homozygosity for the allele Sl produced long radishes, homozygosity for the allele Sr produces round radishes, and the heterozygous Sl/Sr is oval in shape. If long radishes are crossed to oval ones and the F1 plants are then crossed at random among themselves, what phenotypic ratio is expected among the F2? Show your work.