Which of the following processes represents an example of incomplete dominance in genetics?

Answer and explanation

Correct answer: A. Flower colour inheritance in Mirabilis jalapa (4 o'clock plant)

  1. Step 1: Incomplete dominance is a non-Mendelian inheritance pattern where the heterozygous phenotype is an intermediate blend between both homozygous phenotypes.
  2. Step 2: In Mirabilis jalapa (four o'clock plant), crossing homozygous red-flowered plants () with homozygous white-flowered plants () produces all pink-flowered offspring () in the generation.
  3. Step 3: Self-fertilization of the generation results in a phenotypic and genotypic ratio of ().
Answer
Flower colour inheritance in Mirabilis jalapa (4 o'clock plant).
Why not the others: ABO blood grouping in humans is a textbook example of codominance (alleles and both expressed equally in type AB) and multiple allelism; Coat colour inheritance in homozygous pea plants follows complete Mendelian dominance; Human skin pigmentation inheritance exemplifies polygenic (quantitative) inheritance governed by multiple additive gene loci.

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