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Recently, scientists discovered that a rare disorder called polkadotism is caused by a bacterial strain, polkadotiae. Mice injected with this strain (P) develop polka dots on their skin. Heat-killed P bacteria and live D bacteria, a nonvirulent strain, do not produce polka dots when injected separately into mice. However, when a mixture of heat-killed P cells and live D cells were injected together, the mice developed polka dots. What process explains this result? Describe what is happening in the mouse to cause this outcome.

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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 8, Problem 6QP
Textbook Problem
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Recently, scientists discovered that a rare disorder called polkadotism is caused by a bacterial strain, polkadotiae. Mice injected with this strain (P) develop polka dots on their skin. Heat-killed P bacteria and live D bacteria, a nonvirulent strain, do not produce polka dots when injected separately into mice. However, when a mixture of heat-killed P cells and live D cells were injected together, the mice developed polka dots. What process explains this result? Describe what is happening in the mouse to cause this outcome.

Summary Introduction

To describe: The process of developing polka dots on the skin of mice on injecting polkadotiae strain P alone or a mixture of heat-killed P cells and live D cells together.

Introduction: In the twentieth century, pneumonia was the predominant cause of death in the United States. Medical researchers including a famous microbiologist, Fredrick Griffith studied pneumonia to develop an effective treatment for this infectious disease.

Explanation of Solution

Polkadotism, a rare disorder is caused by bacterial strain polkadotiae. In the experiment, mice were injected with strain P and they developed polka dots on their skin. When mice were injected with heat-killed P bacteria and live D bacteria, they do not produce polka dots. A mixture of heat-killed P cells and live D cells were injected together and mice developed polka dots.

This process is known as transformation which was discovered by Fredrick Griffith. In the given experiment, P bacteria contain genetic information even though the cells were heat killed...

Summary Introduction

To explain: The changes in the mouse to develop polka dots on the skin.

Introduction: In the twentieth century, pneumonia was the predominant cause of death in the United States. Medical researchers including a famous microbiologist, Fredrick Griffith studied pneumonia to develop an effective treatment for this infectious disease.

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