Question:

Pattern of inheritance of flower colour in Mirabilis jalapa is similar to that of

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Incomplete dominance results in a blending of traits — neither allele is completely dominant. A classic example: red × white = pink.
Updated On: Apr 17, 2025
  • ABO blood group in human beings
  • Flower colour in snapdragon
  • Fur colour in rabbit
  • Skin colour in human beings
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The Correct Option is B

Solution and Explanation

Step 1: Understand the inheritance in Mirabilis jalapa.
Mirabilis jalapa (Four o’clock plant) exhibits incomplete dominance, a condition where the dominant allele is not completely dominant over the recessive one.

Example: When a red-flowered plant (RR) is crossed with a white-flowered plant (rr), the F1 generation consists of plants with pink flowers (Rr) — an intermediate phenotype.

Step 2: Match with the options.
Option (1) ABO blood group – shows codominance (IA and IB are codominant).
Option (2) Flower colour in snapdragon – also shows incomplete dominance, just like Mirabilis jalapa.
Option (3) Fur colour in rabbit – influenced by multiple alleles.
Option (4) Skin colour in humans – is a polygenic trait.

Step 3: Conclusion.
Since both Mirabilis jalapa and snapdragon exhibit incomplete dominance, option (2) is correct.
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