The phenotype of progeny associated with the cross between stp strain of Neurospora (female) with the wild-type strain (male). Introduction: In the year 1952, Mary Mitchell isolated a mutant strain of Neurospora exhibiting an erratic stop-and-start growth pattern. She termed this strain as a poky strain possessing altered mtDNA cytochrome, which leads to erratic stop-and-start growth. This phenotype is inherited from the cytoplasmic contributing female parent.

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Answer 1

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Chapter 3, Problem 46P

Summary Introduction

To explain: The phenotype of progeny associated with the cross between stp strain of Neurospora (female) with the wild-type strain (male).

Introduction: In the year 1952, Mary Mitchell isolated a mutant strain of Neurospora exhibiting an erratic stop-and-start growth pattern. She termed this strain as a poky strain possessing altered mtDNA cytochrome, which leads to erratic stop-and-start growth. This phenotype is inherited from the cytoplasmic contributing female parent.

Summary Introduction

To explain: The phenotypes of progeny associated with the reciprocal cross between stp strain of Neurospora (male) and the wild-type strain (female).

Introduction: In the reciprocal cross, the phenotype of mother and father is exchanged to determine whether sex influences the inheritance pattern.

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A Neurospora colony at the edge of a plate seemed to be sparse (low density) in comparison with the other colonies on the plate. This colony was thought to be a possible mutant, and so it was removed and crossed with a wild type of the opposite mating type. From this cross, 100 ascospore progeny were obtained. None of the colonies from these ascospores was sparse, all appearing to be normal. What is the simplest explanation of this result? How would you test your explanation? (Note: Neurospora is haploid.)

A yeast geneticist irradiates haploid cells of a strain that is an adenine-requiring auxotrophic mutant, caused by mutation of the gene ade1. Millions of the irradiated cells 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 of results.b. Write the genotypes of the prototrophs in each case.c. What progeny phenotypes and ratios do you predict from crossing a prototroph of type 2 by the original ade1auxotroph?

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 3, Problem 46P

Summary Introduction

To explain: The phenotype of progeny associated with the cross between stp strain of Neurospora (female) with the wild-type strain (male).

Introduction: In the year 1952, Mary Mitchell isolated a mutant strain of Neurospora exhibiting an erratic stop-and-start growth pattern. She termed this strain as a poky strain possessing altered mtDNA cytochrome, which leads to erratic stop-and-start growth. This phenotype is inherited from the cytoplasmic contributing female parent.

Summary Introduction

To explain: The phenotypes of progeny associated with the reciprocal cross between stp strain of Neurospora (male) and the wild-type strain (female).

Introduction: In the reciprocal cross, the phenotype of mother and father is exchanged to determine whether sex influences the inheritance pattern.

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Answer 3

Question

Chapter 3, Problem 46P

Summary Introduction

To explain: The phenotype of progeny associated with the cross between stp strain of Neurospora (female) with the wild-type strain (male).

Introduction: In the year 1952, Mary Mitchell isolated a mutant strain of Neurospora exhibiting an erratic stop-and-start growth pattern. She termed this strain as a poky strain possessing altered mtDNA cytochrome, which leads to erratic stop-and-start growth. This phenotype is inherited from the cytoplasmic contributing female parent.

Summary Introduction

To explain: The phenotypes of progeny associated with the reciprocal cross between stp strain of Neurospora (male) and the wild-type strain (female).

Introduction: In the reciprocal cross, the phenotype of mother and father is exchanged to determine whether sex influences the inheritance pattern.

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Answer 4

Question

Chapter 3, Problem 46P

Summary Introduction

To explain: The phenotype of progeny associated with the cross between stp strain of Neurospora (female) with the wild-type strain (male).

Introduction: In the year 1952, Mary Mitchell isolated a mutant strain of Neurospora exhibiting an erratic stop-and-start growth pattern. She termed this strain as a poky strain possessing altered mtDNA cytochrome, which leads to erratic stop-and-start growth. This phenotype is inherited from the cytoplasmic contributing female parent.

Summary Introduction

To explain: The phenotypes of progeny associated with the reciprocal cross between stp strain of Neurospora (male) and the wild-type strain (female).

Introduction: In the reciprocal cross, the phenotype of mother and father is exchanged to determine whether sex influences the inheritance pattern.

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Answer 5

Chapter 3, Problem 46P

Summary Introduction

To explain: The phenotype of progeny associated with the cross between stp strain of Neurospora (female) with the wild-type strain (male).

Introduction: In the year 1952, Mary Mitchell isolated a mutant strain of Neurospora exhibiting an erratic stop-and-start growth pattern. She termed this strain as a poky strain possessing altered mtDNA cytochrome, which leads to erratic stop-and-start growth. This phenotype is inherited from the cytoplasmic contributing female parent.

Summary Introduction

To explain: The phenotypes of progeny associated with the reciprocal cross between stp strain of Neurospora (male) and the wild-type strain (female).

Introduction: In the reciprocal cross, the phenotype of mother and father is exchanged to determine whether sex influences the inheritance pattern.

Answer 6

Chapter 3, Problem 46P

Summary Introduction

To explain: The phenotype of progeny associated with the cross between stp strain of Neurospora (female) with the wild-type strain (male).

Introduction: In the year 1952, Mary Mitchell isolated a mutant strain of Neurospora exhibiting an erratic stop-and-start growth pattern. She termed this strain as a poky strain possessing altered mtDNA cytochrome, which leads to erratic stop-and-start growth. This phenotype is inherited from the cytoplasmic contributing female parent.

Answer 7

Chapter 3, Problem 46P

Summary Introduction

To explain: The phenotype of progeny associated with the cross between stp strain of Neurospora (female) with the wild-type strain (male).

Introduction: In the year 1952, Mary Mitchell isolated a mutant strain of Neurospora exhibiting an erratic stop-and-start growth pattern. She termed this strain as a poky strain possessing altered mtDNA cytochrome, which leads to erratic stop-and-start growth. This phenotype is inherited from the cytoplasmic contributing female parent.

Answer 8

Summary Introduction

To explain: The phenotypes of progeny associated with the reciprocal cross between stp strain of Neurospora (male) and the wild-type strain (female).

Introduction: In the reciprocal cross, the phenotype of mother and father is exchanged to determine whether sex influences the inheritance pattern.

Answer 9

Summary Introduction

To explain: The phenotypes of progeny associated with the reciprocal cross between stp strain of Neurospora (male) and the wild-type strain (female).

Introduction: In the reciprocal cross, the phenotype of mother and father is exchanged to determine whether sex influences the inheritance pattern.

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 explains the phenotype of progeny associated with the reciprocal cross between stp strain of Neurospora and the wild-type strain.

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To explain: The phenotypes of progeny associated with the reciprocal cross between stp strain of Neurospora (male) and the wild-type strain (female).

Introduction: In the reciprocal cross, the phenotype of mother and father is exchanged to determine whether sex influences the inheritance pattern.

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Chapter 3 Solutions

Solution Summary: The author explains the phenotype of progeny associated with the reciprocal cross between stp strain of Neurospora and the wild-type strain.

Concept explainers

Videos

To explain: The phenotypes of progeny associated with the reciprocal cross between stp strain of Neurospora (male) and the wild-type strain (female). Introduction: In the reciprocal cross, the phenotype of mother and father is exchanged to determine whether sex influences the inheritance pattern.

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Chapter 3 Solutions

To explain: The phenotypes of progeny associated with the reciprocal cross between stp strain of Neurospora (male) and the wild-type strain (female).

Introduction: In the reciprocal cross, the phenotype of mother and father is exchanged to determine whether sex influences the inheritance pattern.