The reason for no growth of the unmixed bacterial strains in the Lederberg and Tatum experiment. Introduction: The experiment performed by Lederberg and Tatum was conducted to understand the mechanism of transformation in bacteria. The experiment was later continued by Davis to finally prove that direct contact is pre-requisite for conjugation to occur.

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Chapter 18.5, Problem 2EQ

Summary Introduction

To determine: The reason for no growth of the unmixed bacterial strains in the Lederberg and Tatum experiment.

Introduction: The experiment performed by Lederberg and Tatum was conducted to understand the mechanism of transformation in bacteria. The experiment was later continued by Davis to finally prove that direct contact is pre-requisite for conjugation to occur.

Summary Introduction

To determine: The significance of the mixed strains on the culture plate.

Introduction: The mixing of the strains met– bio– thr+ pro+ and met+ bio+ thr– pro– did not produce colonies due to lack of the mechanisms to synthesize the required amino acids. However, the mixing of the strains lead to production of new strain, which was capable of growing on the culture media

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Question #3: In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming there was just one gene conferring gametophytic obligate apomixis, and that the two parents are inbreds, what would be the consequences of such a cross if: a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the parental cross. b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the…

Answer 2

Question

Chapter 18.5, Problem 2EQ

Summary Introduction

To determine: The reason for no growth of the unmixed bacterial strains in the Lederberg and Tatum experiment.

Introduction: The experiment performed by Lederberg and Tatum was conducted to understand the mechanism of transformation in bacteria. The experiment was later continued by Davis to finally prove that direct contact is pre-requisite for conjugation to occur.

Summary Introduction

To determine: The significance of the mixed strains on the culture plate.

Introduction: The mixing of the strains met– bio– thr+ pro+ and met+ bio+ thr– pro– did not produce colonies due to lack of the mechanisms to synthesize the required amino acids. However, the mixing of the strains lead to production of new strain, which was capable of growing on the culture media

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Answer 3

Question

Chapter 18.5, Problem 2EQ

Summary Introduction

To determine: The reason for no growth of the unmixed bacterial strains in the Lederberg and Tatum experiment.

Introduction: The experiment performed by Lederberg and Tatum was conducted to understand the mechanism of transformation in bacteria. The experiment was later continued by Davis to finally prove that direct contact is pre-requisite for conjugation to occur.

Summary Introduction

To determine: The significance of the mixed strains on the culture plate.

Introduction: The mixing of the strains met– bio– thr+ pro+ and met+ bio+ thr– pro– did not produce colonies due to lack of the mechanisms to synthesize the required amino acids. However, the mixing of the strains lead to production of new strain, which was capable of growing on the culture media

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Answer 4

Question

Chapter 18.5, Problem 2EQ

Summary Introduction

To determine: The reason for no growth of the unmixed bacterial strains in the Lederberg and Tatum experiment.

Introduction: The experiment performed by Lederberg and Tatum was conducted to understand the mechanism of transformation in bacteria. The experiment was later continued by Davis to finally prove that direct contact is pre-requisite for conjugation to occur.

Summary Introduction

To determine: The significance of the mixed strains on the culture plate.

Introduction: The mixing of the strains met– bio– thr+ pro+ and met+ bio+ thr– pro– did not produce colonies due to lack of the mechanisms to synthesize the required amino acids. However, the mixing of the strains lead to production of new strain, which was capable of growing on the culture media

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Answer 5

Chapter 18.5, Problem 2EQ

Summary Introduction

To determine: The reason for no growth of the unmixed bacterial strains in the Lederberg and Tatum experiment.

Introduction: The experiment performed by Lederberg and Tatum was conducted to understand the mechanism of transformation in bacteria. The experiment was later continued by Davis to finally prove that direct contact is pre-requisite for conjugation to occur.

Summary Introduction

To determine: The significance of the mixed strains on the culture plate.

Introduction: The mixing of the strains met– bio– thr+ pro+ and met+ bio+ thr– pro– did not produce colonies due to lack of the mechanisms to synthesize the required amino acids. However, the mixing of the strains lead to production of new strain, which was capable of growing on the culture media

Answer 6

Chapter 18.5, Problem 2EQ

Summary Introduction

To determine: The reason for no growth of the unmixed bacterial strains in the Lederberg and Tatum experiment.

Introduction: The experiment performed by Lederberg and Tatum was conducted to understand the mechanism of transformation in bacteria. The experiment was later continued by Davis to finally prove that direct contact is pre-requisite for conjugation to occur.

Answer 7

Chapter 18.5, Problem 2EQ

Summary Introduction

To determine: The reason for no growth of the unmixed bacterial strains in the Lederberg and Tatum experiment.

Introduction: The experiment performed by Lederberg and Tatum was conducted to understand the mechanism of transformation in bacteria. The experiment was later continued by Davis to finally prove that direct contact is pre-requisite for conjugation to occur.

Answer 8

Summary Introduction

To determine: The significance of the mixed strains on the culture plate.

Introduction: The mixing of the strains met– bio– thr+ pro+ and met+ bio+ thr– pro– did not produce colonies due to lack of the mechanisms to synthesize the required amino acids. However, the mixing of the strains lead to production of new strain, which was capable of growing on the culture media

Answer 9

Summary Introduction

To determine: The significance of the mixed strains on the culture plate.

Introduction: The mixing of the strains met– bio– thr+ pro+ and met+ bio+ thr– pro– did not produce colonies due to lack of the mechanisms to synthesize the required amino acids. However, the mixing of the strains lead to production of new strain, which was capable of growing on the culture media

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 18.1 - Prob. 1CC Ch. 18.2 - Prob. 1BC Ch. 18.2 - Viral Reproductive Cycles Concept Check: From the...Ch. 18.4 - Prob. 1CC Ch. 18.4 - Genetic Properties of Bacteria Core Skill:...Ch. 18.4 - Prob. 2CC Ch. 18.4 - Genetic Properties of Bacteria Concept Check:...Ch. 18.4 - Prob. 4CC Ch. 18.5 - Prob. 1CC Ch. 18.5 - Prob. 1EQ

Solution Summary: The author explains Lederberg and Tatum's experiment to understand the mechanism of transformation in bacteria, and Davis' experiments to prove that direct contact is pre-requisite for conjugation.

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