Question:
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) :Continuous inbreeding may lead to complete loss of the inbred lines
Reason (R) : It is desirable to propagate the parental inbred lines by tissue culture techniques.
In light of the above statements, choose the correct answer from the options given below.
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) :Continuous inbreeding may lead to complete loss of the inbred lines
Reason (R) : It is desirable to propagate the parental inbred lines by tissue culture techniques.
In light of the above statements, choose the correct answer from the options given below.
Assertion (A) :Continuous inbreeding may lead to complete loss of the inbred lines
Reason (R) : It is desirable to propagate the parental inbred lines by tissue culture techniques.
In light of the above statements, choose the correct answer from the options given below.
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Remember that parental inbred lines of seed crops are maintained through selfing or sib-mating in physical isolation, not by micropropagation.
This makes the reason statement immediately identifiable as incorrect.
This makes the reason statement immediately identifiable as incorrect.
Updated On: Jul 31, 2026
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
- (A) is true but (R) is false.
- (A) is false but (R) is true.
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Inbreeding depression is the loss of vigor and fertility resulting from continuous self-fertilization or close-mating in cross-pollinated species.
Inbred lines are highly homozygous lines used as parents to produce commercial hybrids.
Step 2: Detailed Explanation:
Let us analyze the Assertion and Reason statements:
Assertion (A): Continuous inbreeding leads to progressive homozygosity.
In cross-pollinated species, this exposes lethal and sub-lethal recessive alleles that were previously masked in the heterozygous state.
This results in severe inbreeding depression, which can cause poor seed set, low pollen viability, high disease susceptibility, and ultimately the complete loss/extinction of the inbred lines over generations.
Thus, Assertion (A) is correct.
Reason (R): Propagating parental inbred lines of standard field or vegetable crops via tissue culture is neither commercially standard nor desirable.
Inbred lines are genetically maintained and multiplied by selfing or sibmating under strictly isolated field conditions.
Using tissue culture is not cost-effective for large-scale hybrid seed production, and it introduces the risk of somaclonal variations, which would ruin the genetic uniformity of the parental line.
Thus, Reason (R) is incorrect.
Therefore, (A) is true but (R) is false.
Step 3: Final Answer:
(A) is true but (R) is false.
Inbreeding depression is the loss of vigor and fertility resulting from continuous self-fertilization or close-mating in cross-pollinated species.
Inbred lines are highly homozygous lines used as parents to produce commercial hybrids.
Step 2: Detailed Explanation:
Let us analyze the Assertion and Reason statements:
Assertion (A): Continuous inbreeding leads to progressive homozygosity.
In cross-pollinated species, this exposes lethal and sub-lethal recessive alleles that were previously masked in the heterozygous state.
This results in severe inbreeding depression, which can cause poor seed set, low pollen viability, high disease susceptibility, and ultimately the complete loss/extinction of the inbred lines over generations.
Thus, Assertion (A) is correct.
Reason (R): Propagating parental inbred lines of standard field or vegetable crops via tissue culture is neither commercially standard nor desirable.
Inbred lines are genetically maintained and multiplied by selfing or sibmating under strictly isolated field conditions.
Using tissue culture is not cost-effective for large-scale hybrid seed production, and it introduces the risk of somaclonal variations, which would ruin the genetic uniformity of the parental line.
Thus, Reason (R) is incorrect.
Therefore, (A) is true but (R) is false.
Step 3: Final Answer:
(A) is true but (R) is false.
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