In Antirrhinum two plants with pink flowers were hybridized. The F_1 plants produced red, pink and white flowers in the proportion of 1 red, 2 pink…

In Antirrhinum two plants with pink flowers were hybridized. The $\displaystyle \mathrm{F}_1$ plants produced red, pink and white flowers in the proportion of $\displaystyle 1$ red, $\displaystyle 2$ pink and $\displaystyle 1$ white. What could be the genotype of the two plants used for hybridization? Red flower colour is determined by $\displaystyle R R$, and white by $\displaystyle r r$ genes.