# Variations in Phenotype Expression Suppose space explorers discover an alien species governed by the same genetic principles that apply to humans. Although all 19 aliens analyzed to date carry a gene for a third eye, only 15 display this phenotype. What is the penetrance of the third-eye gene in this population?

### Human Heredity: Principles and Iss...

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

Chapter
Section

### Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 4, Problem 26QP
Textbook Problem
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## Variations in Phenotype ExpressionSuppose space explorers discover an alien species governed by the same genetic principles that apply to humans. Although all 19 aliens analyzed to date carry a gene for a third eye, only 15 display this phenotype. What is the penetrance of the third-eye gene in this population?

Summary Introduction

To explain: The penetrance of third eye gene in the population of 19 aliens.

Introduction: The probability of the trait expression is called penetrance. It can also be defined as the probability of the expression of disease phenotype, only when the genotype of the disease is present. For example, if the penetrance of the gene is 100 %, then the dominant disorder has a mutant phenotype in all the individuals who carry defected alleles.

### Explanation of Solution

The space explorers have governed the genetic characteristics of some alien species. Space exploration applied the same genetic principles on the species of aliens. There were 19 aliens, who carried the gene for the third eye, but this phenotype was displayed only in 15 individuals. So, the penetrance of the gene of the third eye in the alien's species would be calculated as follows:

Penetrance=Numberof

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