Chapter 28, Problem 9STP

Summary Introduction

Introduction:

Mutation is known as the permanent change occurs in the DNA. Mutations may result from DNA copying errors made during exposure to ionizing radiation, cell division, virus infection, or exposure to chemicals. Mutations can range from changes in a single base pair in the coding sequence of DNA to the deletions of large pieces of chromosomes.

Answer to Problem 9STP

Correct answer:

The correct answer is option (A) frame shift.

Explanation of Solution

Explanation/justification for the correct answer:

Option (A) frame shift. Substitution and deletion mutations change the multiples of three codons from the point of the insertion or deletion and they are known as frame shift mutation because they change the frame of the amino acid sequence. So, the correct answer is option (A).

Explanation for incorrect answer:

Option (B) missense. In the missense mutation, the DNA code is modified so that it codes for the wrong amino acid. So, this is an incorrect option.

Option (C) substitution. A point mutation in which a basis is substituted for another is called a substitution. So, this is an incorrect answer.

Option (D) tandem repeat. A new type of mutation was discovered that includes an increase in the number of copies of repeated codons. This form of mutation is named as tandem mutation. So, this is an incorrect answer.