Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052



Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 14, Problem 8QP
Textbook Problem

DNA Profiles as Tools for Identification

STRs are:

  1. a. used for DNA profiles
  2. b. repeated sequences present in the human genome
  3. c. highly variable in copy number
  4. d. all of these
  5. e. none of these

Summary Introduction

Introduction: DNA is also known as deoxyribonucleic acid. The genetic material of an individual is packed in the form of DNA. A DNA strand is a collection of more than one monomeric unit of nucleotides. A phosphate group, a sugar, and four nitrogenous bases which contain nitrogen give rise to a nucleotide. Two strands of polynucleotide chains which are complementary to each other are coiled together to form a DNA molecule.

Explanation of Solution

Reason for correct answer:

STRs are also known as Short Tandem Repeats. An individual’s genome has certain sequences of nucleotide bases which are repeated and these sequences are known as short tandem repeats. The stretches of these repeats are from two to nine nucleotides long. DNA profiles are constructed with the help of short tandem repeats. STRs have different alleles and are variable in copy numbers.

Option d. is given as “all of these”

Development of DNA profiles requires STRs as they are the repeated sequences present in the genome of humans and are extremely variable in the number of copies. Hence, the correct answer is option d.

Reasons for incorrect answer:

Option a. is given as, “used for DNA profiles”.

It is correct that short tandem repeats are an essential requirement to build DNA profiles but since option b. and option c. are also correct the given option is incorrect. Hence, option a. is incorrect.

Option b. is given as, “repeated sequences present in the human genome”...

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