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Analysis of X-Linked Dominant and Recessive Traits In the eighteenth century, a young boy with a skin condition known as ichthyosis hystrix gravior was identified. The phenotype of this disorder includes thickening of skin and the formation of loose spines that are sloughed off periodically. This man married and had six sons, all of whom had the same condition. He also had several daughters, all of whom were unaffected. In all succeeding generations, the condition was passed on from father to son. What can you theorize about the location of the gene that causes ichthyosis hystrix gravior?

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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 4, Problem 22QP
Textbook Problem
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Analysis of X-Linked Dominant and Recessive Traits

In the eighteenth century, a young boy with a skin condition known as ichthyosis hystrix gravior was identified. The phenotype of this disorder includes thickening of skin and the formation of loose spines that are sloughed off periodically. This man married and had six sons, all of whom had the same condition. He also had several daughters, all of whom were unaffected. In all succeeding generations, the condition was passed on from father to son. What can you theorize about the location of the gene that causes ichthyosis hystrix gravior?

Summary Introduction

To explain: The conditions that theorize about the location of the gene that leads to the development of ichthyosis hystrix gravior.

Introduction: Ichthyosis hystrix gravior is a rare genetic disorder. It is characterized by the thickening of skin which causes the appearance of spiny scales on the skin. These loose spines are sloughed off on a regular basis. This is mostly observed in men.

Explanation of Solution

A young boy had ichthyosis hystrix gravior condition. After the marriage of this man, the condition was transmitted to all his sons. Although he had several daughters also, none of the daughters was affected by this disease. This disease was transmitted in all the succeeding generations from the fathers to the sons.

As the disease is just transmitted to the son, this is inferred that thegene for this trait is located on the Y-chromosome...

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