The interpretation of the results from the progeny number and the probable genotypes. Introduction: The mutation is the change in the nucleotide sequence of the gene, which results in either the formation of a defective protein or no protein at all. The mutation can also alter the regulation of certain genes leading to their hyperactivity or hypoactivity..

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Answer 1

Question

Chapter 3, Problem 39P

a.

Summary Introduction

To determine: The interpretation of the results from the progeny number and the probable genotypes.

Introduction: The mutation is the change in the nucleotide sequence of the gene, which results in either the formation of a defective protein or no protein at all. The mutation can also alter the regulation of certain genes leading to their hyperactivity or hypoactivity..

b.

Summary Introduction

To determine: The proportion of testcross progeny that will have no trichomes from the cross between original mutant A and original mutant B.

Introduction: The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism.

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Here are schematic diagrams of mutant Drosophila larvae. The left side of each pair shows a wild-type larva, with gray boxes showing the sections that are missing in the mutant larva. Which type of gene is defective in each larva: a gap gene, a pair-rule gene, or a segment-polarity gene?

To understand the genetic basis of locomotion in the diploid nematode Caenorhabditis elegans, recessive mutations were obtained, all making the worm “wiggle” ineffectually instead of moving with its usual smooth gliding motion. These mutations presumably affect the nervous or muscle systems. Twelve homozygous mutants were intercrossed, and the F1 hybrids were examined to see if they wiggled. The results were as follows, where a plus sign means that the F1 hybrid was wild type (gliding) and “w” means that the hybrid wiggled.a. Explain what this experiment was designed to test. b. Use this reasoning to assign genotypes to all 12 mutants. c. Explain why the phenotype of the F1 hybrids between mutants 1 and 2 differed from that of the hybrids between mutants 1 and 5

An undergraduate researcher in your lab is studying mutations affecting the wings of Drosophila melanogaster. She has identified two mutant phenotypes of interest: bent wings (be), which are recessive to the wild-type straight wings (be+), and apterous (ap) mutants (which are wingless). The apallele is recessive to the wild-type allele (ap+), which allows wings to develop. If a homozygous bent-winged fly (which possesses the normal allele of apterous) is crossed with a homozygous wingless fly (which possesses the normal allele of bent wings), what phenotypic ratio would you expect to observe in the F2 generation of this cross? a) Please indicate the ratio, including the genotypes and phenotypes of all phenotypic classes. Phenotype: Genotype(s) corresponding to this phenotype Phenotypic ratio: (Be sure to NAME the classes in the ratio). B) Please NAME and DEFINE the type of gene interaction illustrated in this example.

Answer 2

Question

Chapter 3, Problem 39P

a.

Summary Introduction

To determine: The interpretation of the results from the progeny number and the probable genotypes.

Introduction: The mutation is the change in the nucleotide sequence of the gene, which results in either the formation of a defective protein or no protein at all. The mutation can also alter the regulation of certain genes leading to their hyperactivity or hypoactivity..

b.

Summary Introduction

To determine: The proportion of testcross progeny that will have no trichomes from the cross between original mutant A and original mutant B.

Introduction: The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism.

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Answer 3

Question

Chapter 3, Problem 39P

a.

Summary Introduction

To determine: The interpretation of the results from the progeny number and the probable genotypes.

Introduction: The mutation is the change in the nucleotide sequence of the gene, which results in either the formation of a defective protein or no protein at all. The mutation can also alter the regulation of certain genes leading to their hyperactivity or hypoactivity..

b.

Summary Introduction

To determine: The proportion of testcross progeny that will have no trichomes from the cross between original mutant A and original mutant B.

Introduction: The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism.

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Answer 4

Question

Chapter 3, Problem 39P

a.

Summary Introduction

To determine: The interpretation of the results from the progeny number and the probable genotypes.

Introduction: The mutation is the change in the nucleotide sequence of the gene, which results in either the formation of a defective protein or no protein at all. The mutation can also alter the regulation of certain genes leading to their hyperactivity or hypoactivity..

b.

Summary Introduction

To determine: The proportion of testcross progeny that will have no trichomes from the cross between original mutant A and original mutant B.

Introduction: The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism.

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Answer 5

Chapter 3, Problem 39P

a.

Summary Introduction

To determine: The interpretation of the results from the progeny number and the probable genotypes.

Introduction: The mutation is the change in the nucleotide sequence of the gene, which results in either the formation of a defective protein or no protein at all. The mutation can also alter the regulation of certain genes leading to their hyperactivity or hypoactivity..

b.

Summary Introduction

To determine: The proportion of testcross progeny that will have no trichomes from the cross between original mutant A and original mutant B.

Introduction: The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism.

Answer 6

Chapter 3, Problem 39P

a.

Summary Introduction

To determine: The interpretation of the results from the progeny number and the probable genotypes.

Introduction: The mutation is the change in the nucleotide sequence of the gene, which results in either the formation of a defective protein or no protein at all. The mutation can also alter the regulation of certain genes leading to their hyperactivity or hypoactivity..

Answer 7

Chapter 3, Problem 39P

a.

Summary Introduction

To determine: The interpretation of the results from the progeny number and the probable genotypes.

Introduction: The mutation is the change in the nucleotide sequence of the gene, which results in either the formation of a defective protein or no protein at all. The mutation can also alter the regulation of certain genes leading to their hyperactivity or hypoactivity..

Answer 8

b.

Summary Introduction

To determine: The proportion of testcross progeny that will have no trichomes from the cross between original mutant A and original mutant B.

Introduction: The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism.

Answer 9

b.

Summary Introduction

To determine: The proportion of testcross progeny that will have no trichomes from the cross between original mutant A and original mutant B.

Introduction: The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism.

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 3 - Prob. 1P Ch. 3 - Prob. 2P Ch. 3 - Prob. 3P Ch. 3 - Prob. 4P Ch. 3 - Prob. 5P Ch. 3 - Prob. 6P Ch. 3 - Prob. 7P Ch. 3 - Prob. 8P Ch. 3 - Prob. 9P Ch. 3 - Prob. 10P

Solution Summary: The author compares the number of progeny from the F2 genetaion from mutant A with the ratio of 3:1, which corresponds to the Mendelian ratio.

Videos

To determine: The proportion of testcross progeny that will have no trichomes from the cross between original mutant A and original mutant B.

Introduction: The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism.

Want to see the full answer?

Chapter 3 Solutions

Solution Summary: The author compares the number of progeny from the F2 genetaion from mutant A with the ratio of 3:1, which corresponds to the Mendelian ratio.

Videos

To determine: The proportion of testcross progeny that will have no trichomes from the cross between original mutant A and original mutant B. Introduction: The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism.

Want to see the full answer?

Chapter 3 Solutions

To determine: The proportion of testcross progeny that will have no trichomes from the cross between original mutant A and original mutant B.

Introduction: The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism.