Question:
Given below are two statements:
Statement (I): Dominance deviations are interactions of within locus.
Statement (II): Breeding values and genotypic values are the same in the absence of dominance.
In light of the above statements, choose the most appropriate answer from the options given below:
Given below are two statements:
Statement (I): Dominance deviations are interactions of within locus.
Statement (II): Breeding values and genotypic values are the same in the absence of dominance.
In light of the above statements, choose the most appropriate answer from the options given below:
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- Dominance deviation = Intralocus interaction (within one gene).
- Epistatic deviation = Interlocus interaction (between different genes).
- Without dominance (\( D = 0 \)), Genotypic Value equals Breeding Value (\( G = A \)).
- Epistatic deviation = Interlocus interaction (between different genes).
- Without dominance (\( D = 0 \)), Genotypic Value equals Breeding Value (\( G = A \)).
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 A
Solution and Explanation
Step 1: Understanding the Concept:
The genotypic value (\( G \)) of an individual can be partitioned into three components:
\[ G = A + D + I \]
where:
\( A \) is the breeding value (additive genetic effect),
\( D \) is the dominance deviation,
\( I \) is the epistatic interaction deviation.
Step 2: Detailed Explanation:
Let us analyze both statements.
- Statement (I) defines dominance deviations.
Dominance deviation represents the deviation of the heterozygote from the average of the two homozygotes.
This effect arises from the interaction between alleles at the *same* locus (intralocus interaction).
Because it is an interaction within a single locus, Statement (I) is correct.
- Statement (II) compares breeding values and genotypic values.
In a single-locus model (where epistasis \( I = 0 \)), the genotypic value is:
\[ G = A + D \]
If dominance is absent (\( D = 0 \)), the equation simplifies to:
\[ G = A \]
This shows that in the absence of dominance, the genotypic value is identical to the breeding value (additive genetic value).
Thus, Statement (II) is correct.
Therefore, both Statement (I) and Statement (II) are correct.
Step 3: Final Answer:
Both Statement (I) and Statement (II) are correct, corresponding to option 1.
The genotypic value (\( G \)) of an individual can be partitioned into three components:
\[ G = A + D + I \]
where:
\( A \) is the breeding value (additive genetic effect),
\( D \) is the dominance deviation,
\( I \) is the epistatic interaction deviation.
Step 2: Detailed Explanation:
Let us analyze both statements.
- Statement (I) defines dominance deviations.
Dominance deviation represents the deviation of the heterozygote from the average of the two homozygotes.
This effect arises from the interaction between alleles at the *same* locus (intralocus interaction).
Because it is an interaction within a single locus, Statement (I) is correct.
- Statement (II) compares breeding values and genotypic values.
In a single-locus model (where epistasis \( I = 0 \)), the genotypic value is:
\[ G = A + D \]
If dominance is absent (\( D = 0 \)), the equation simplifies to:
\[ G = A \]
This shows that in the absence of dominance, the genotypic value is identical to the breeding value (additive genetic value).
Thus, Statement (II) is correct.
Therefore, both Statement (I) and Statement (II) are correct.
Step 3: Final Answer:
Both Statement (I) and Statement (II) are correct, corresponding to option 1.
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