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NEETZoologyPrinciples of Inheritance and Variation

In a certain monohybrid cross, the F₁ offspring exhibit a phenotype that does not resemble either of the two parents and is intermediate between them. Upon selfing of these F₁ individuals, the F₂ generation produces a phenotypic ratio that is exactly identical to its genotypic ratio (1:2:1). Which of the following examples best represents this genetic phenomenon?

Options

  1. AABO blood grouping in humans
  2. BSkin colour in humans
  3. CPhenylketonuria
  4. DFlower colour in dog flower

Correct answer

D. Flower colour in dog flower

Step-by-step solution

The phenomenon described is incomplete dominance, where the F₁ phenotype is intermediate between the two parents and does not resemble either of them completely. In incomplete dominance, the F₂ phenotypic ratio is 1:2:1, which is identical to the genotypic ratio. Flower colour in dog flower (Antirrhinum) is a classic example of incomplete dominance. ABO blood grouping is an example of co-dominance and multiple allelism. Skin colour in humans is an example of polygenic inheritance, which shows continuous variation.

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