In Antirrhinum, two plants with pink flowers were hybridized. The F1 plants produced red, pink, and white flowers in the proportion of 1 red, 2 pink and 1 white. What could be the genotype of the two plants used for hybridization? Red flower colour is determined by RR, and White by rr genes.
RR
Rr
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, the inheritance of flower colour in the dog flower (Antirrhinum sp.) is a classic example of incomplete dominance. In this plant, the cross between true-breeding red (RR) and white (rr) flowers results in an F1 generation with pink flowers (Rr). When these F1 pink flowers are self-pollinated (or hybridized with another pink flower), the F2 generation exhibits a ratio of 1 (RR) Red : 2 (Rr) Pink : 1 (rr) White . Therefore, for the parents to be pink, they must both have the genotype Rr.
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