Question

Suppose you have monohybrid snapdragons in your garden and you find that they produce red seeds to white seeds in the ratio of 3:1. If the alleles are designated R (red seeds) and r (white seeds), what are the probable genotypes of the snapdragons in your garden?

Answer 1

The parents (P1) will be all red. The monohybrid snapdragons producing red and white seeds in the ratio of 3:1  the red (R) phenotype being dominant and white(r) being recessive, might possibly have the  parents with the following genotypes:

Rr (Red)                  Rr (Red)

Answer 2

The parents (P1) will be all red. The monohybrid snapdragons producing red and white seeds in the ratio of 3:1 with the red (R) phenotype being dominant and white(r) being recessive, might possibly have the  parents with the following genotypes:

Rr (Red)                  Rr (Red)

The gametes produced by these parents will be R and R. The cross of these parents (P1) will result in the following generation that will be in the ratio of 3:1 (red:white) :