Question

Point mutation is _______.

• A. sudden change in the chemical make up of a gene
• B. alteration in allele frequency
• C. changes in gene arrangement in chromosome
• D. gradual, continuous change in genetic make up

Hint:

Point mutations affect only one nucleotide base in a gene.

Answer 1

The Correct Option is A

Step 1: Understanding point mutation.
A point mutation involves a change in a single nucleotide base in the DNA sequence of a gene.
Step 2: Evaluating the options.
(A) sudden change in the chemical make up of a gene: Correct. Point mutation alters the nucleotide sequence of a gene.
(B) alteration in allele frequency: Incorrect. It relates to population genetics.
(C) changes in gene arrangement in chromosome: Incorrect. This refers to chromosomal mutation.
(D) gradual, continuous change in genetic make up: Incorrect. This describes evolution.
Step 3: Conclusion.
The correct answer is (A) sudden change in the chemical make up of a gene.