Question:
Which one of the following is the product of Narrow-Sense Heritability and Selection Differential?
Which one of the following is the product of Narrow-Sense Heritability and Selection Differential?
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Genetic Gain ($\Delta G$) tells you: "If I pick the best 10% trees, how much taller will the next generation be?" It is the single most important metric for a tree breeder.
Updated On: Aug 7, 2026
- Genetic advance
- Genetic Co-efficient of Variation
- Heterosis
- Genetic Gain
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
This question involves the fundamental formula of quantitative genetics used in plant and tree breeding to predict the success of selection.
Key Formula or Approach:
The formula for predicting the response to selection is: \[ \Delta G = h^2 \times S \] Where: - \(\Delta G\) is the Genetic Gain (the change in the population mean).
- \(h^2\) is the Narrow-sense Heritability (ratio of additive genetic variance to total phenotypic variance).
- \(S\) is the Selection Differential (the difference between the mean of the selected parents and the mean of the original population).
Step 2: Detailed Explanation:
• Genetic Gain represents the expected improvement in the next generation.
• Narrow-sense heritability (\(h^2\)) is used because only additive gene effects are reliably passed from parent to offspring.
• The Selection Differential (\(S\)) measure how much "pressure" the breeder puts on selection.
• Therefore, the product of how much of a trait is inheritable (\(h^2\)) and how much better the selected parents are (\(S\)) equals the actual improvement achieved (\(G\)).
Step 3: Final Answer:
The product of narrow-sense heritability and selection differential is Genetic Gain.
This question involves the fundamental formula of quantitative genetics used in plant and tree breeding to predict the success of selection.
Key Formula or Approach:
The formula for predicting the response to selection is: \[ \Delta G = h^2 \times S \] Where: - \(\Delta G\) is the Genetic Gain (the change in the population mean).
- \(h^2\) is the Narrow-sense Heritability (ratio of additive genetic variance to total phenotypic variance).
- \(S\) is the Selection Differential (the difference between the mean of the selected parents and the mean of the original population).
Step 2: Detailed Explanation:
• Genetic Gain represents the expected improvement in the next generation.
• Narrow-sense heritability (\(h^2\)) is used because only additive gene effects are reliably passed from parent to offspring.
• The Selection Differential (\(S\)) measure how much "pressure" the breeder puts on selection.
• Therefore, the product of how much of a trait is inheritable (\(h^2\)) and how much better the selected parents are (\(S\)) equals the actual improvement achieved (\(G\)).
Step 3: Final Answer:
The product of narrow-sense heritability and selection differential is Genetic Gain.
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