In Antirrhinum, two plants with pink flowers were hybridized. The F1 plants produced red, pink, and white flow

Question

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.

Accepted Answer

, 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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