Considering the hybridization in a trait like the color of the flowers of a given plant species (yellow recessive / red dominant) conditioned by a pair of different alleles, what are the phenotypical results of the first generation (F1) and the phenotypical results of the second generation (F2, formed by crossing among F1 genotypes)? What are the phenotypical proportions in F1 and F2?
In the relation to genotypes and phenotypes the hybridization comprises of: parental generation (P): RR (read), yy (yellow). F1 generation (RR x yy): Ry (red). F2 generation (Ry x Ry): RR (red), Ry (red), Ry (red) and yy (yellow).
In F1 generation the proportion of red flowers is 100%. In the F2 generation, the phenotypical proportion is three red (75%) to one yellow (25%).