Chapter 13, Problem 16STP

Summary Introduction

To write:

Names of two DNA mutations along with their illustrations through the given DNA sequence.

Introduction:

A permanent change in the cell’s DNA is called mutation. This change occurs in the nucleotide sequence in DNA. It can be caused by errors in replication, transcription, cell division or by some external agents.

Answer to Problem 16STP

Two types of mutations are insertions and deletions.

The given DNA sequence is:

CGA TTG ACG TTT TAG GAT

Insertion of ‘A’ after 6^th base- CGA TTG AAC GTT TTA GGA T

Deletion of ‘G’ after 1^st base-CAT TGA CGT TTT AGG AT

Explanation of Solution

Mutations can occur in single base pair or a large section of DNA may be deleted. Point mutation in one base pair may cause genetic disorder. There are many types of point mutations; substitution mutation, insertions, deletions etc.

Insertions occur when a nucleotide is added to the DNA sequence.

The given DNA sequence is:

CGA TTG ACG TTT TAG GAT

If ‘A’ is inserted after 6^th base, it would change the given sequence as:

CGA TTG AAC GTT TTA GGA T

Deletion occurs when a nucleotide is removed from a DNA sequence.The given DNA sequence is:

CGA TTG ACG TTT TAG GAT

If the 2nd‘G’ is deleted, it would the change the given sequence as:

CATTGACGT TTTAGGAT