Question:
Which one of the following does NOT show non-allelic interaction?
Which one of the following does NOT show non-allelic interaction?
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Non-allelic interaction needs two or more different genes. Co-dominance involves two alleles of the same gene.
Updated On: Nov 12, 2026
- Pleiotropy
- Co-dominance
- Polygenes
- Complementary genes
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Non-allelic (intergenic) interaction means that two or more different genes together influence a trait.
Step 2: Examples that fit
Complementary genes, such as those for flower colour in sweet pea, and polygenes, such as those for human skin colour, involve more than one gene.
Step 3: Co-dominance
In co-dominance both alleles of the same gene express themselves fully, as in the human ABO blood group. This is an allelic interaction.
Step 4: Conclusion
So co-dominance does not show non-allelic interaction.
Final Answer:
Co-dominance does not show non-allelic interaction. \[ \boxed{\text{(B) }\text{Co-dominance}} \]
Non-allelic (intergenic) interaction means that two or more different genes together influence a trait.
Step 2: Examples that fit
Complementary genes, such as those for flower colour in sweet pea, and polygenes, such as those for human skin colour, involve more than one gene.
Step 3: Co-dominance
In co-dominance both alleles of the same gene express themselves fully, as in the human ABO blood group. This is an allelic interaction.
Step 4: Conclusion
So co-dominance does not show non-allelic interaction.
Final Answer:
Co-dominance does not show non-allelic interaction. \[ \boxed{\text{(B) }\text{Co-dominance}} \]
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