(a) To determine: The mutation that was induced by X-rays. Introduction: A haploid strain with wild-type phenotype was mated with a haploid strain that has w - , x - , y - , and z - genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

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Answer 1

Question

Chapter 12, Problem 6P

Summary Introduction

(a)

To determine:

The mutation that was induced by X-rays.

Introduction:

A haploid strain with wild-type phenotype was mated with a haploid strain that has w^-, x^-, y^-, and z^- genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

Summary Introduction

(b)

To determine:

The reason that two spores in each ascus die.

Introduction:

The ascomycetes fungus can perform sexual reproduction. It produces spores using sexual reproduction. The ascus is the part of these fungi that releases spores. The spores are vital parts of ascomycetes.

Summary Introduction

(c)

To determine:

Whether the genes w, x, y, or z are located on the same chromosome.

Introduction:

Chromosomes are present in the eukaryotic organisms. They are “thread-like” in appearance. A chromosome is made up of two units: DNA and proteins. The genes can either be present on the same chromosome or a different chromosome.

Summary Introduction

(d)

To determine:

The order of genes that are present on the same chromosomes.

Introduction:

The genes that are present on the same chromosome have a similar type of function. The genes w, x, y, or z are located on the same chromosome. They are the pseudo-dominant genes. They are all recessive genes, but they dominate each other.

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Baker's yeast, Saccharomyces cerevisiae, is a single-celled, diploid fungus (which is, of course, a eukaryote, that is capable of both meiosis and sexual reproduction). Wild type yeast can normally grow on solid or liquid minimal medium; you isolate three mutant strains which are no longer capable of growing on minimal medium alone, however, they can grow on medium supplemented with adenine. All three yeast strains are homozygous for the underlying alleles. When you cross mutant strain 1 and mutant strain 2, the offspring cannot grow on minimal medium alone and require adenine supplementation; when you cross mutant strain 1 and mutant strain 3, the offspring can grow on minimal medium alone and do not require adenine. A. What conclusions can you make about the alleles of mutant strains 1, 2, and 3 and their relationships with each other? B. What phenomenon is occurring in the cross between mutant strains 1 and 3? After crossing the F1 generation of the cross between mutant strains 1…

Baker's yeast, Saccharomyces cerevisiae, is a single-celled, diploid fungus (which is, of course, a eukaryote, that is capable of both meiosis and sexual reproduction). Wild type yeast can normally grow on solid or liquid minimal medium; you isolate three mutant strains which are no longer capable of growing on minimal medium alone, however, they can grow on medium supplemented with adenine. All three yeast strains are homozygous for the underlying alleles. When you cross mutant strain 1 and mutant strain 2, the offspring cannot grow on minimal medium alone and require adenine supplementation; when you cross mutant strain 1 and mutant strain 3, the offspring can grow on minimal medium alone and do not require adenine. A. What conclusions can you make about the alleles of mutant strains 1, 2, and 3 and their relationships with each other? B. What phenomenon is occurring in the cross between mutant strains 1 and 3?

A yeast geneticist irradiates haploid cells of a strain thatis an adenine-requiring auxotrophic mutant, caused bymutation of the gene ade1. Millions of the irradiatedcells are plated on minimal medium, and a small number of cells divide and produce prototrophic colonies.These colonies are crossed individually with a wildtype strain. Two types of results are obtained:(1) prototroph × wild type : progeny all prototrophic(2) prototroph × wild type : progeny 75% prototrophic,25% adenine-requiring auxotrophsa. Explain the difference between these two types ofresults.b. Write the genotypes of the prototrophs in each case.c. What progeny phenotypes and ratios do you predictfrom crossing a prototroph of type 2 by the original ade1auxotroph?

Answer 2

Question

Chapter 12, Problem 6P

Summary Introduction

(a)

To determine:

The mutation that was induced by X-rays.

Introduction:

A haploid strain with wild-type phenotype was mated with a haploid strain that has w^-, x^-, y^-, and z^- genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

Summary Introduction

(b)

To determine:

The reason that two spores in each ascus die.

Introduction:

The ascomycetes fungus can perform sexual reproduction. It produces spores using sexual reproduction. The ascus is the part of these fungi that releases spores. The spores are vital parts of ascomycetes.

Summary Introduction

(c)

To determine:

Whether the genes w, x, y, or z are located on the same chromosome.

Introduction:

Chromosomes are present in the eukaryotic organisms. They are “thread-like” in appearance. A chromosome is made up of two units: DNA and proteins. The genes can either be present on the same chromosome or a different chromosome.

Summary Introduction

(d)

To determine:

The order of genes that are present on the same chromosomes.

Introduction:

The genes that are present on the same chromosome have a similar type of function. The genes w, x, y, or z are located on the same chromosome. They are the pseudo-dominant genes. They are all recessive genes, but they dominate each other.

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Check out a sample textbook solution

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Answer 3

Question

Chapter 12, Problem 6P

Summary Introduction

(a)

To determine:

The mutation that was induced by X-rays.

Introduction:

A haploid strain with wild-type phenotype was mated with a haploid strain that has w^-, x^-, y^-, and z^- genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

Summary Introduction

(b)

To determine:

The reason that two spores in each ascus die.

Introduction:

The ascomycetes fungus can perform sexual reproduction. It produces spores using sexual reproduction. The ascus is the part of these fungi that releases spores. The spores are vital parts of ascomycetes.

Summary Introduction

(c)

To determine:

Whether the genes w, x, y, or z are located on the same chromosome.

Introduction:

Chromosomes are present in the eukaryotic organisms. They are “thread-like” in appearance. A chromosome is made up of two units: DNA and proteins. The genes can either be present on the same chromosome or a different chromosome.

Summary Introduction

(d)

To determine:

The order of genes that are present on the same chromosomes.

Introduction:

The genes that are present on the same chromosome have a similar type of function. The genes w, x, y, or z are located on the same chromosome. They are the pseudo-dominant genes. They are all recessive genes, but they dominate each other.

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 4

Question

Chapter 12, Problem 6P

Summary Introduction

(a)

To determine:

The mutation that was induced by X-rays.

Introduction:

A haploid strain with wild-type phenotype was mated with a haploid strain that has w^-, x^-, y^-, and z^- genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

Summary Introduction

(b)

To determine:

The reason that two spores in each ascus die.

Introduction:

The ascomycetes fungus can perform sexual reproduction. It produces spores using sexual reproduction. The ascus is the part of these fungi that releases spores. The spores are vital parts of ascomycetes.

Summary Introduction

(c)

To determine:

Whether the genes w, x, y, or z are located on the same chromosome.

Introduction:

Chromosomes are present in the eukaryotic organisms. They are “thread-like” in appearance. A chromosome is made up of two units: DNA and proteins. The genes can either be present on the same chromosome or a different chromosome.

Summary Introduction

(d)

To determine:

The order of genes that are present on the same chromosomes.

Introduction:

The genes that are present on the same chromosome have a similar type of function. The genes w, x, y, or z are located on the same chromosome. They are the pseudo-dominant genes. They are all recessive genes, but they dominate each other.

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 5

Chapter 12, Problem 6P

Summary Introduction

(a)

To determine:

The mutation that was induced by X-rays.

Introduction:

A haploid strain with wild-type phenotype was mated with a haploid strain that has w^-, x^-, y^-, and z^- genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

Summary Introduction

(b)

To determine:

The reason that two spores in each ascus die.

Introduction:

The ascomycetes fungus can perform sexual reproduction. It produces spores using sexual reproduction. The ascus is the part of these fungi that releases spores. The spores are vital parts of ascomycetes.

Summary Introduction

(c)

To determine:

Whether the genes w, x, y, or z are located on the same chromosome.

Introduction:

Chromosomes are present in the eukaryotic organisms. They are “thread-like” in appearance. A chromosome is made up of two units: DNA and proteins. The genes can either be present on the same chromosome or a different chromosome.

Summary Introduction

(d)

To determine:

The order of genes that are present on the same chromosomes.

Introduction:

The genes that are present on the same chromosome have a similar type of function. The genes w, x, y, or z are located on the same chromosome. They are the pseudo-dominant genes. They are all recessive genes, but they dominate each other.

Answer 6

Chapter 12, Problem 6P

Summary Introduction

(a)

To determine:

The mutation that was induced by X-rays.

Introduction:

A haploid strain with wild-type phenotype was mated with a haploid strain that has w^-, x^-, y^-, and z^- genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

Answer 7

Chapter 12, Problem 6P

Summary Introduction

(a)

To determine:

The mutation that was induced by X-rays.

Introduction:

A haploid strain with wild-type phenotype was mated with a haploid strain that has w^-, x^-, y^-, and z^- genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

Answer 8

Summary Introduction

(b)

To determine:

The reason that two spores in each ascus die.

Introduction:

The ascomycetes fungus can perform sexual reproduction. It produces spores using sexual reproduction. The ascus is the part of these fungi that releases spores. The spores are vital parts of ascomycetes.

Answer 9

Summary Introduction

(b)

To determine:

The reason that two spores in each ascus die.

Introduction:

The ascomycetes fungus can perform sexual reproduction. It produces spores using sexual reproduction. The ascus is the part of these fungi that releases spores. The spores are vital parts of ascomycetes.

Answer 10

Summary Introduction

(c)

To determine:

Whether the genes w, x, y, or z are located on the same chromosome.

Introduction:

Chromosomes are present in the eukaryotic organisms. They are “thread-like” in appearance. A chromosome is made up of two units: DNA and proteins. The genes can either be present on the same chromosome or a different chromosome.

Answer 11

Summary Introduction

(c)

To determine:

Whether the genes w, x, y, or z are located on the same chromosome.

Introduction:

Chromosomes are present in the eukaryotic organisms. They are “thread-like” in appearance. A chromosome is made up of two units: DNA and proteins. The genes can either be present on the same chromosome or a different chromosome.

Answer 12

Summary Introduction

(d)

To determine:

The order of genes that are present on the same chromosomes.

Introduction:

The genes that are present on the same chromosome have a similar type of function. The genes w, x, y, or z are located on the same chromosome. They are the pseudo-dominant genes. They are all recessive genes, but they dominate each other.

Answer 13

Summary Introduction

(d)

To determine:

The order of genes that are present on the same chromosomes.

Introduction:

The genes that are present on the same chromosome have a similar type of function. The genes w, x, y, or z are located on the same chromosome. They are the pseudo-dominant genes. They are all recessive genes, but they dominate each other.

Answer 14

Expert Solution & Answer

Answer 15

Expert Solution & Answer

Answer 16

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Answer 17

Ch. 12 - For each of the terms in the left column, choose...Ch. 12 - Prob. 2P Ch. 12 - For each of the following types of chromosomal...Ch. 12 - For the following types of chromosomal...Ch. 12 - One of the X chromosomes in a particular...Ch. 12 - Prob. 6P Ch. 12 - Prob. 7P Ch. 12 - Prob. 8P Ch. 12 - Two wild-type fragments of human genomic DNA from...Ch. 12 - Indicate which of the four major classes of...

(a) To determine: The mutation that was induced by X-rays. Introduction: A haploid strain with wild-type phenotype was mated with a haploid strain that has w - , x - , y - , and z - genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

Solution Summary: The author describes how X-rays were used to induce mutations in diploid strains. Deletion mutation causes removal or deletion of nucleotides from the genome.

Concept explainers

Videos

(a)

To determine:

The mutation that was induced by X-rays.

Introduction:

A haploid strain with wild-type phenotype was mated with a haploid strain that has w^-, x^-, y^-, and z^- genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

(b)

To determine:

The reason that two spores in each ascus die.

Introduction:

The ascomycetes fungus can perform sexual reproduction. It produces spores using sexual reproduction. The ascus is the part of these fungi that releases spores. The spores are vital parts of ascomycetes.

Want to see the full answer?

Chapter 12 Solutions

(a) To determine: The mutation that was induced by X-rays. Introduction: A haploid strain with wild-type phenotype was mated with a haploid strain that has w - , x - , y - , and z - genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

Solution Summary: The author describes how X-rays were used to induce mutations in diploid strains. Deletion mutation causes removal or deletion of nucleotides from the genome.

Concept explainers

Videos

(a) To determine: The mutation that was induced by X-rays. Introduction: A haploid strain with wild-type phenotype was mated with a haploid strain that has w-, x-, y-, and z- genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

(b) To determine: The reason that two spores in each ascus die. Introduction: The ascomycetes fungus can perform sexual reproduction. It produces spores using sexual reproduction. The ascus is the part of these fungi that releases spores. The spores are vital parts of ascomycetes.

Want to see the full answer?

Chapter 12 Solutions

(a)

To determine:

The mutation that was induced by X-rays.

Introduction:

A haploid strain with wild-type phenotype was mated with a haploid strain that has w^-, x^-, y^-, and z^- genes. This type of mating produced diploid strains. X-rays were used to induce mutations in the diploid strains.

(b)

To determine:

The reason that two spores in each ascus die.

Introduction:

The ascomycetes fungus can perform sexual reproduction. It produces spores using sexual reproduction. The ascus is the part of these fungi that releases spores. The spores are vital parts of ascomycetes.