a. To hypothesize: The mechanism by which each of the three SCN9A mutations affects gene structure and the reason due to which truncated proteins are made in each case. Introduction: The SCN9A gene has 26 exons and encodes a 1977-amino acid polypeptide. The homozygosity for extremely rare mutations in the SCN9A gene cause complete insensitivity to pain called congenital pain insensitivity or CPA, and a total lack of the sense of smell called anosmia.

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Answer 1

Question

Chapter 8, Problem 46P

Summary Introduction

a.

To hypothesize:

The mechanism by which each of the three SCN9A mutations affects gene structure and the reason due to which truncated proteins are made in each case.

Introduction:

The SCN9A gene has 26 exons and encodes a 1977-amino acid polypeptide. The homozygosity for extremely rare mutations in the SCN9A gene cause complete insensitivity to pain called congenital pain insensitivity or CPA, and a total lack of the sense of smell called anosmia.

Summary Introduction

b.

To determine:

Whether the mutant alleles cause loss of function or gain of function and whether they are amorphs, hypomorphs, hypermorphs, neomorphs, or antimorphs.

Introduction:

The information in DNA is the starting point of gene expression. The cell transcribes that information into mRNA and then translates the mRNA information into protein. Mutations can alter the nucleotide pairs of DNA as well as any step or product of gene expression. Mutations within the gene coding regions alter the gene product. The mutations outside the coding region can also alter gene expression.

Summary Introduction

c.

To explain:

The mechanism due to which CPA or anosmia is a recessive condition in molecular terms.

Introduction:

Mutations affect phenotype by changing either the amino acid sequence of a protein or the amount of the gene product produced. For protein-coding genes, the mutations either prevent the synthesis of the polypeptide or promote the synthesis of a nonfunctional protein.

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Answer 2

Question

Chapter 8, Problem 46P

Summary Introduction

a.

To hypothesize:

The mechanism by which each of the three SCN9A mutations affects gene structure and the reason due to which truncated proteins are made in each case.

Introduction:

The SCN9A gene has 26 exons and encodes a 1977-amino acid polypeptide. The homozygosity for extremely rare mutations in the SCN9A gene cause complete insensitivity to pain called congenital pain insensitivity or CPA, and a total lack of the sense of smell called anosmia.

Summary Introduction

b.

To determine:

Whether the mutant alleles cause loss of function or gain of function and whether they are amorphs, hypomorphs, hypermorphs, neomorphs, or antimorphs.

Introduction:

The information in DNA is the starting point of gene expression. The cell transcribes that information into mRNA and then translates the mRNA information into protein. Mutations can alter the nucleotide pairs of DNA as well as any step or product of gene expression. Mutations within the gene coding regions alter the gene product. The mutations outside the coding region can also alter gene expression.

Summary Introduction

c.

To explain:

The mechanism due to which CPA or anosmia is a recessive condition in molecular terms.

Introduction:

Mutations affect phenotype by changing either the amino acid sequence of a protein or the amount of the gene product produced. For protein-coding genes, the mutations either prevent the synthesis of the polypeptide or promote the synthesis of a nonfunctional protein.

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Answer 3

Question

Chapter 8, Problem 46P

Summary Introduction

a.

To hypothesize:

The mechanism by which each of the three SCN9A mutations affects gene structure and the reason due to which truncated proteins are made in each case.

Introduction:

The SCN9A gene has 26 exons and encodes a 1977-amino acid polypeptide. The homozygosity for extremely rare mutations in the SCN9A gene cause complete insensitivity to pain called congenital pain insensitivity or CPA, and a total lack of the sense of smell called anosmia.

Summary Introduction

b.

To determine:

Whether the mutant alleles cause loss of function or gain of function and whether they are amorphs, hypomorphs, hypermorphs, neomorphs, or antimorphs.

Introduction:

The information in DNA is the starting point of gene expression. The cell transcribes that information into mRNA and then translates the mRNA information into protein. Mutations can alter the nucleotide pairs of DNA as well as any step or product of gene expression. Mutations within the gene coding regions alter the gene product. The mutations outside the coding region can also alter gene expression.

Summary Introduction

c.

To explain:

The mechanism due to which CPA or anosmia is a recessive condition in molecular terms.

Introduction:

Mutations affect phenotype by changing either the amino acid sequence of a protein or the amount of the gene product produced. For protein-coding genes, the mutations either prevent the synthesis of the polypeptide or promote the synthesis of a nonfunctional protein.

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Answer 4

Question

Chapter 8, Problem 46P

Summary Introduction

a.

To hypothesize:

The mechanism by which each of the three SCN9A mutations affects gene structure and the reason due to which truncated proteins are made in each case.

Introduction:

The SCN9A gene has 26 exons and encodes a 1977-amino acid polypeptide. The homozygosity for extremely rare mutations in the SCN9A gene cause complete insensitivity to pain called congenital pain insensitivity or CPA, and a total lack of the sense of smell called anosmia.

Summary Introduction

b.

To determine:

Whether the mutant alleles cause loss of function or gain of function and whether they are amorphs, hypomorphs, hypermorphs, neomorphs, or antimorphs.

Introduction:

The information in DNA is the starting point of gene expression. The cell transcribes that information into mRNA and then translates the mRNA information into protein. Mutations can alter the nucleotide pairs of DNA as well as any step or product of gene expression. Mutations within the gene coding regions alter the gene product. The mutations outside the coding region can also alter gene expression.

Summary Introduction

c.

To explain:

The mechanism due to which CPA or anosmia is a recessive condition in molecular terms.

Introduction:

Mutations affect phenotype by changing either the amino acid sequence of a protein or the amount of the gene product produced. For protein-coding genes, the mutations either prevent the synthesis of the polypeptide or promote the synthesis of a nonfunctional protein.

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Answer 5

Chapter 8, Problem 46P

Summary Introduction

a.

To hypothesize:

The mechanism by which each of the three SCN9A mutations affects gene structure and the reason due to which truncated proteins are made in each case.

Introduction:

The SCN9A gene has 26 exons and encodes a 1977-amino acid polypeptide. The homozygosity for extremely rare mutations in the SCN9A gene cause complete insensitivity to pain called congenital pain insensitivity or CPA, and a total lack of the sense of smell called anosmia.

Summary Introduction

b.

To determine:

Whether the mutant alleles cause loss of function or gain of function and whether they are amorphs, hypomorphs, hypermorphs, neomorphs, or antimorphs.

Introduction:

The information in DNA is the starting point of gene expression. The cell transcribes that information into mRNA and then translates the mRNA information into protein. Mutations can alter the nucleotide pairs of DNA as well as any step or product of gene expression. Mutations within the gene coding regions alter the gene product. The mutations outside the coding region can also alter gene expression.

Summary Introduction

c.

To explain:

The mechanism due to which CPA or anosmia is a recessive condition in molecular terms.

Introduction:

Mutations affect phenotype by changing either the amino acid sequence of a protein or the amount of the gene product produced. For protein-coding genes, the mutations either prevent the synthesis of the polypeptide or promote the synthesis of a nonfunctional protein.

Answer 6

Chapter 8, Problem 46P

Summary Introduction

a.

To hypothesize:

The mechanism by which each of the three SCN9A mutations affects gene structure and the reason due to which truncated proteins are made in each case.

Introduction:

The SCN9A gene has 26 exons and encodes a 1977-amino acid polypeptide. The homozygosity for extremely rare mutations in the SCN9A gene cause complete insensitivity to pain called congenital pain insensitivity or CPA, and a total lack of the sense of smell called anosmia.

Answer 7

Chapter 8, Problem 46P

Summary Introduction

a.

To hypothesize:

The mechanism by which each of the three SCN9A mutations affects gene structure and the reason due to which truncated proteins are made in each case.

Introduction:

The SCN9A gene has 26 exons and encodes a 1977-amino acid polypeptide. The homozygosity for extremely rare mutations in the SCN9A gene cause complete insensitivity to pain called congenital pain insensitivity or CPA, and a total lack of the sense of smell called anosmia.

Answer 8

Summary Introduction

b.

To determine:

Whether the mutant alleles cause loss of function or gain of function and whether they are amorphs, hypomorphs, hypermorphs, neomorphs, or antimorphs.

Introduction:

The information in DNA is the starting point of gene expression. The cell transcribes that information into mRNA and then translates the mRNA information into protein. Mutations can alter the nucleotide pairs of DNA as well as any step or product of gene expression. Mutations within the gene coding regions alter the gene product. The mutations outside the coding region can also alter gene expression.

Answer 9

Summary Introduction

b.

To determine:

Whether the mutant alleles cause loss of function or gain of function and whether they are amorphs, hypomorphs, hypermorphs, neomorphs, or antimorphs.

Introduction:

The information in DNA is the starting point of gene expression. The cell transcribes that information into mRNA and then translates the mRNA information into protein. Mutations can alter the nucleotide pairs of DNA as well as any step or product of gene expression. Mutations within the gene coding regions alter the gene product. The mutations outside the coding region can also alter gene expression.

Answer 10

Summary Introduction

c.

To explain:

The mechanism due to which CPA or anosmia is a recessive condition in molecular terms.

Introduction:

Mutations affect phenotype by changing either the amino acid sequence of a protein or the amount of the gene product produced. For protein-coding genes, the mutations either prevent the synthesis of the polypeptide or promote the synthesis of a nonfunctional protein.

Answer 11

Summary Introduction

c.

To explain:

The mechanism due to which CPA or anosmia is a recessive condition in molecular terms.

Introduction:

Mutations affect phenotype by changing either the amino acid sequence of a protein or the amount of the gene product produced. For protein-coding genes, the mutations either prevent the synthesis of the polypeptide or promote the synthesis of a nonfunctional protein.

Answer 12

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Answer 13

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Answer 14

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Answer 15

Ch. 8 - For each of the terms in the left column, choose...Ch. 8 - Match the hypothesis from the left column to the...Ch. 8 - How would the artificial mRNA 5GUGUGUGU . . . 3 be...Ch. 8 - An example of a portion of the T4 rIIB gene in...Ch. 8 - Consider Crick and Brenners experiments in Fig....Ch. 8 - The HbSsickle-cell allele of the human -globin...Ch. 8 - The following diagram describes the mRNA sequence...Ch. 8 - The amino acid sequence of part of a protein has...Ch. 8 - The results shown in Fig. 8.5 may have struck you...Ch. 8 - Identify all the amino acid-specifying codons in...

Solution Summary: The author explains the mechanism by which each of the three SCN9A mutations affects gene structure and the reason for truncated proteins.

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Chapter 8 Solutions