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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 5, Problem 17QP
Textbook Problem
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Monozygotic (MZ) twins have a concordance value of 44% for a specific trait, whereas dizygotic twins have a concordance value of less than 5% for the same trait. What could explain why the value for MZ twins is significantly less than 100%?

Summary Introduction

To determine: The reason behind the significantly lower value of less than 100% for MZ(monozygotic) twins when the monozygotic twins have a concordance value of 44% for a specific trait and the dizygotic twins have a concordance value of less than 5% for the same trait.

Introduction: The concordance value is defined as the agreement between the traits that are exhibited by both the twins. Traits show concordance if both have a trait and are discordant if only one twin has that trait.

Explanation of Solution

Heritability is defined as the proportion of phenotypic variation that is caused by differences in the genotype. Concordance is defined as the probability that a few people will have the same trait.

Due to heritability and environmental factors, monozygotic twins having the same genes may not display the same trait...

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