Question:
The term "hybrid vigour" is used to denote
The term "hybrid vigour" is used to denote
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Hybrid vigour = Heterosis.
Superiority of hybrids over parents.
Causes: Dominance, Overdominance, Epistasis.
Superiority of hybrids over parents.
Causes: Dominance, Overdominance, Epistasis.
Updated On: Sep 1, 2026
- Gene mutation
- Elevated expressivity of genes
- Genetic recombination
- Favorable environmental conditions
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of heterosis (hybrid vigour).
Step 2: Detailed Explanation:
Hybrid vigour (heterosis) is used to denote elevated expressivity of genes.
It results in increased growth, yield, and fertility in hybrids.
The mechanism involves:
- Dominance: Dominant alleles mask deleterious recessives.
- Overdominance: Heterozygotes are superior.
Gene mutation (A): Changes in gene sequence.
Genetic recombination (C): Rearrangement of genes.
Favorable environmental conditions (D): Not related to hybrid vigour.
Thus, hybrid vigour refers to elevated expressivity of genes.
Step 3: Final Answer:
Thus, hybrid vigour denotes elevated expressivity of genes, which corresponds to option (B).
[0.5cm]
This question tests knowledge of heterosis (hybrid vigour).
Step 2: Detailed Explanation:
Hybrid vigour (heterosis) is used to denote elevated expressivity of genes.
It results in increased growth, yield, and fertility in hybrids.
The mechanism involves:
- Dominance: Dominant alleles mask deleterious recessives.
- Overdominance: Heterozygotes are superior.
Gene mutation (A): Changes in gene sequence.
Genetic recombination (C): Rearrangement of genes.
Favorable environmental conditions (D): Not related to hybrid vigour.
Thus, hybrid vigour refers to elevated expressivity of genes.
Step 3: Final Answer:
Thus, hybrid vigour denotes elevated expressivity of genes, which corresponds to option (B).
[0.5cm]
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