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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 28QP
Textbook Problem
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Variations in Phenotype Expression

Explain how camptodactyly is an example of expressivity.

Summary Introduction

To explain: The way in which camptodactyly is considered as an example of expressivity.

Introduction: Expressivity can be defined as the rate at which the expression of a particular trait differs among individuals. It determines the degree of expression of a specific trait. The example of expressivity includes polydactyl or extra toes in cats.

Explanation of Solution

Camptodactyly is an autosomal dominant trait which reduces the movement and causes a bent in the little finger. As it is a dominant trait; so, all the individuals, including both homozygous dominant (AA) and heterozygous (Aa), must have the unmovable and bent little finger in both the hands.

However, through the pedigree analysis, it was concluded that the phenotypic expression of camptodactyly is not observed in the entire individual, who carries the dominant mutant allele...

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