Biology: Life on Earth with Physiology (11th Edition)
Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 14, Problem 1MC
Summary Introduction

Introduction:

Single nucleotide polymorphism is caused by the change of an amino acid at a single position in the amino acid chain of the protein. It causes a change in the structure, conformation and molecular function of the protein.

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Answer to Problem 1MC

Correct answer:

Translocation causes a change in the location of the gene on the chromosome locus whereas single nucleotide polymorphism is caused due to change of an amino acid at a single position in the polypeptide chain. Therefore, option (a) is correct.

Option (a) is given as “It is usually caused by a translocation mutation”.

Explanation of Solution

Justify reasons for the correct statement:

Single nucleotide polymorphism changes the structure, function and molecular mechanism of the protein due to an alteration of an amino-acid at a single position on the polypeptide chain.

Hence, option (a) is correct.

Justify reasons for the incorrect statements:

Option (b) is given as “It is usually caused by a nucleotide substitution mutation”. This mutation causes a change in the amino acid present at a specific position in the polypeptide leading to a change in the functioning mechanism of the protein. Hence, it is a wrong answer.

Option (c) is given as “It may change the phenotype of an organism”. The phenotype of an organism is changed due to change in the sequence of the nucleotide of the genes present on chromosomes. Hence, it is a wrong answer.

Option (d) is given as “It is inherited from parent to offspring”. Genes are inherited from parent to offspring. Hence, it is a wrong answer.

Hence, options (b), (c), and (d) are incorrect.

Conclusion

The statement which is not true regarding the single nucleotide polymorphism is that it is usually caused by a translocation mutation. Translocation mutation is caused due to the change in the chromosome locus of the gene under study whereas the single nucleotide polymorphism is caused due to the alteration and replacement of an amino-acid at a specific position of the polypeptide chain.

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Students have asked these similar questions
Which of the following statements best describes the outcome of a mutation?   a. A mutation always results in a mutant genotype   b. A mutation always results in a mutant karyotype   c. A mutation always results in a mutant phenotype   d. A mutation always results in a mutant protein
a mutation in dna that adds +1 ot -1 nucleotide or +2 or -2 nucleotides is called a______? (choose one answer only) A. frameshift mutation B. silent mutation C. nonsense mutation D. missense mutation
Are mutations harmful?a. Yes, because the DNA is damaged.b. No, because changes in the DNA result in better alleles.c. Yes, because mutated proteins don’t function.d. It depends on how the mutation affects the protein’s function.

Chapter 14 Solutions

Biology: Life on Earth with Physiology (11th Edition)

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