A red-flowered plant crossed with a white-flowered plant of the same species, produced F1 plants whi

Question

A red-flowered plant crossed with a white-flowered plant of the same species, produced F1 plants which all had pink flowers. Self-pollination of the F1 plants produced an F2 generation in which 39 plants had red flowers, 83 had pink flowers and 40 had white flowers. What does this experiment demonstrate?

Accepted Answer

Sol.(a) [Key Concept: Incomplete Dominance vs Codominance — Flower Colour] Pink F1 flowers from a red × white cross are the classic result of INCOMPLETE DOMINANCE — the heterozygote (Rr) shows an intermediate, blended phenotype, and on selfing gives a 1 red : 2 pink : 1 white ratio in which the genotypic and phenotypic ratios coincide (1:2:1). In true codominance the heterozygote would instead express BOTH parental colours distinctly (e.g., red and white patches), not an intermediate pink. Since 'incomplete dominance' is not listed among the options, the intended choice is the allelic-interaction option, (a).

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