Question:
Which of the following statements are true about Mutation?
(A) Mutation is the only factor responsible for changing gene frequency in a population.
(B) Mutations can be at the gene level or at the chromosomal level.
(C) Radiations are not the only factor responsible for mutations.
(D) Substances that increase the rate of mutation are called mutagens.
Choose the correct answer from the options given below:
Which of the following statements are true about Mutation?
(A) Mutation is the only factor responsible for changing gene frequency in a population.
(B) Mutations can be at the gene level or at the chromosomal level.
(C) Radiations are not the only factor responsible for mutations.
(D) Substances that increase the rate of mutation are called mutagens.
Choose the correct answer from the options given below:
(A) Mutation is the only factor responsible for changing gene frequency in a population.
(B) Mutations can be at the gene level or at the chromosomal level.
(C) Radiations are not the only factor responsible for mutations.
(D) Substances that increase the rate of mutation are called mutagens.
Choose the correct answer from the options given below:
Show Hint
The four fundamental evolutionary forces are:
Mutation, Natural Selection, Genetic Drift, and Gene Flow.
Recognizing that multiple evolutionary forces exist instantly rules out statement (A).
Mutation, Natural Selection, Genetic Drift, and Gene Flow.
Recognizing that multiple evolutionary forces exist instantly rules out statement (A).
Updated On: Sep 4, 2026
- (A) and (D) only
- (B) and (C) only
- (B), (C) and (D) only
- (A) and (B) only
Show Solution
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The Correct Option is C
Solution and Explanation
Concept:
In population genetics and evolutionary biology, a mutation is defined as a sudden, heritable alteration in the genetic material of an organism.
Mutations act as the ultimate source of all novel genetic variation upon which other microevolutionary forces operate.
This question evaluates core concepts regarding the etiology, classification, and population effects of mutations.
Step 1: Evaluating Evolutionary Forces (Statement A):
Statement (A) is incorrect because mutation is not the only factor altering gene frequencies in populations.
Natural selection, genetic drift, gene flow (migration), and non-random mating also dynamically change allele frequencies over generations.
Step 2: Evaluating Mutation Types and Agents (Statements B, C, D):
1. Statement (B) is correct: Mutations occur at the gene level (point mutations, substitutions, frameshifts) or at the chromosomal level (structural translocations/deletions or numerical aneuploidies).
2. Statement (C) is correct: While physical radiations (X-rays, UV radiation) induce mutations, mutations are also triggered by chemical agents (base analogs, alkylating agents) and biological errors during DNA replication.
3. Statement (D) is correct: Any physical, chemical, or biological agent capable of significantly increasing mutation frequency above spontaneous background rates is defined as a mutagen.
Step 3: Final Answer:
Statements (B), (C), and (D) are correct statements.
Therefore, Option (C) is the correct choice.
In population genetics and evolutionary biology, a mutation is defined as a sudden, heritable alteration in the genetic material of an organism.
Mutations act as the ultimate source of all novel genetic variation upon which other microevolutionary forces operate.
This question evaluates core concepts regarding the etiology, classification, and population effects of mutations.
Step 1: Evaluating Evolutionary Forces (Statement A):
Statement (A) is incorrect because mutation is not the only factor altering gene frequencies in populations.
Natural selection, genetic drift, gene flow (migration), and non-random mating also dynamically change allele frequencies over generations.
Step 2: Evaluating Mutation Types and Agents (Statements B, C, D):
1. Statement (B) is correct: Mutations occur at the gene level (point mutations, substitutions, frameshifts) or at the chromosomal level (structural translocations/deletions or numerical aneuploidies).
2. Statement (C) is correct: While physical radiations (X-rays, UV radiation) induce mutations, mutations are also triggered by chemical agents (base analogs, alkylating agents) and biological errors during DNA replication.
3. Statement (D) is correct: Any physical, chemical, or biological agent capable of significantly increasing mutation frequency above spontaneous background rates is defined as a mutagen.
Step 3: Final Answer:
Statements (B), (C), and (D) are correct statements.
Therefore, Option (C) is the correct choice.
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