In radishes,long or round are homozygous forms of an incompletely dominant gene,and oval is the phenotype of the heterozygote.If a long radish is crossed with a round radish,which of the following phenotypic ratios of the F2 generation is correct?
A) all round B) all oval C) 1/2 long, 1/2 oval D) 1 long, 2 oval, 1 round E) 1/2 oval, 1/2 round