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MHT CET Medical202625 April 2026Morning ShiftBiologyPrinciples of Inheritance and VariationActual

Which one of the following does NOT show non-allelic interaction?

Options

  1. APleiotropy
  2. BCo-dominance
  3. CPolygenes
  4. DComplementary genes

Correct answer

B. Co-dominance

Step-by-step solution

Gene interactions can be broadly classified into two types: allelic (intragenic) and non-allelic (intergenic) interactions. Allelic interactions occur between alleles of the same gene. Examples include incomplete dominance, co-dominance, and multiple alleles. In co-dominance, both alleles of a single gene are fully expressed in a heterozygote, making it a classic example of an allelic interaction. Non-allelic interactions occur between alleles of different genes. Examples include epistasis, complementary genes, sup

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