Question:
Given below are two statements:
Statement (I): Mean environmental deviation in population as a whole is taken to be zero.
Statement (II): The tangible environmental variation arises due to un-known causes.
In light of the above statements, choose the most appropriate answer from the options given below:
Given below are two statements:
Statement (I): Mean environmental deviation in population as a whole is taken to be zero.
Statement (II): The tangible environmental variation arises due to un-known causes.
In light of the above statements, choose the most appropriate answer from the options given below:
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Remember:
- Tangible = Macro-environment = Known/Controllable causes.
- Intangible = Micro-environment = Unknown/Random causes.
- Mean Environmental Deviation (\( \bar{E} \)) is always assumed to be \( 0 \) in quantitative genetics.
- Tangible = Macro-environment = Known/Controllable causes.
- Intangible = Micro-environment = Unknown/Random causes.
- Mean Environmental Deviation (\( \bar{E} \)) is always assumed to be \( 0 \) in quantitative genetics.
Updated On: Jul 21, 2026
- Both Statement (I) and Statement (II) are correct.
- Both Statement (I) and Statement (II) are incorrect.
- Statement (I) is correct but Statement (II) is incorrect.
- Statement (I) is incorrect but Statement (II) is correct.
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
In quantitative genetics, phenotypic value (\( P \)) is defined as the sum of genotypic value (\( G \)) and environmental deviation (\( E \)):
\[ P = G + E \]
Environmental variation is divided into tangible (macro-environmental) and intangible (micro-environmental) components.
Step 2: Detailed Explanation:
Let us analyze each statement.
- Statement (I) concerns the mean environmental deviation of a population.
The genotypic value (\( G \)) is defined as the average phenotypic value of a genotype over a large range of environments.
Consequently, across a large, representative population, positive environmental deviations cancel out negative environmental deviations.
By definition, the mean environmental deviation (\( \bar{E} \)) is zero.
Thus, Statement (I) is correct.
- Statement (II) discusses the source of tangible environmental variation.
Tangible environmental variation refers to variation caused by known, identifiable, or controllable factors (such as feeding levels, housing temperature, or age).
Intangible environmental variation refers to variation that arises from unknown, random, or residual physiological causes.
Thus, tangible variation arises from *known* causes, making Statement (II) incorrect.
Therefore, Statement (I) is correct and Statement (II) is incorrect.
Step 3: Final Answer:
Statement (I) is correct but Statement (II) is incorrect, corresponding to option 3.
In quantitative genetics, phenotypic value (\( P \)) is defined as the sum of genotypic value (\( G \)) and environmental deviation (\( E \)):
\[ P = G + E \]
Environmental variation is divided into tangible (macro-environmental) and intangible (micro-environmental) components.
Step 2: Detailed Explanation:
Let us analyze each statement.
- Statement (I) concerns the mean environmental deviation of a population.
The genotypic value (\( G \)) is defined as the average phenotypic value of a genotype over a large range of environments.
Consequently, across a large, representative population, positive environmental deviations cancel out negative environmental deviations.
By definition, the mean environmental deviation (\( \bar{E} \)) is zero.
Thus, Statement (I) is correct.
- Statement (II) discusses the source of tangible environmental variation.
Tangible environmental variation refers to variation caused by known, identifiable, or controllable factors (such as feeding levels, housing temperature, or age).
Intangible environmental variation refers to variation that arises from unknown, random, or residual physiological causes.
Thus, tangible variation arises from *known* causes, making Statement (II) incorrect.
Therefore, Statement (I) is correct and Statement (II) is incorrect.
Step 3: Final Answer:
Statement (I) is correct but Statement (II) is incorrect, corresponding to option 3.
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