alleryIn **incomplete dominance** (e.g. flower colour in *Mirabilis jalapa*), the F₂ phenotypic ratio from a cross of red × white is:
A3 : 1
B1 : 1
C1 : 2 : 1 (red : pink : white)
D9 : 3 : 3 : 1
Answer & Solution
Correct answer: C. 1 : 2 : 1 (red : pink : white)
RR (red) × rr (white) → F₁ Rr (**pink** — intermediate).
Selfing Rr × Rr → 1 RR : 2 Rr : 1 rr
→ phenotypically 1 red : 2 pink : 1 white.
Phenotypic ratio matches genotypic ratio because heterozygotes are visibly distinguishable.
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