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JKCET Incomplete Dominance — practice questions

Explore 1 free Incomplete Dominance questions in JKCET Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Incomplete Dominance questions and exercises with answers

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In **incomplete dominance** (e.g. flower colour in *Mirabilis jalapa*), the F₂ phenotypic ratio from a cross of red × white is:Read the answer and worked solution →

Worked practice questions

In **incomplete dominance** (e.g. flower colour in *Mirabilis jalapa*), the F₂ phenotypic ratio from a cross of red × white is:

  1. 3 : 1
  2. 1 : 1
  3. 1 : 2 : 1 (red : pink : white)
  4. 9 : 3 : 3 : 1
Show answer and 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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