Biology: How Life Works - Standalone book
Biology: How Life Works - Standalone book
2nd Edition
ISBN: 9781464126093
Author: James Morris, Daniel Hartl, Andrew Knoll, Robert Lue, Melissa Michael, Andrew Berry, Andrew Biewener, Brian Farrell, N. Michele Holbrook
Publisher: W. H. Freeman
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Chapter 45, Problem 1QC
Summary Introduction

To explain:

The reason behind the difficulty in identifying an individual gene that governs a particular behavior.

Concept introduction:

The term traits can be defined as the characteristics or the conditions, which are genetically determined. Most often, the traits are physical; however, they may be behavioral as well. There are certain traits, which are determined by one gene or more genes as well as the environment. Such kinds of traits which are cumulatively affected by the genes and environment are known as the multifactorial traits.

Expert Solution & Answer
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Explanation of Solution

The particular behavioral characteristics are not mediated by one factor; rather it is a cumulative effect of multiple factors such as hormones and neuron. This makes it possible to predict an individual gene behind the behavioral factor. There are certain traits which are coded by multiple genes. These genes are most often influenced by the environment. So, the same genes will have different effects in different environment.

Conclusion

Usually, the behavior is not coded by individual gene. The effect of gene is influenced by neurons and hormones. There are certain features which are coded by more than one gene and this condition is known as polygenic traits. These traits are also influenced by environmental factors. So, it is difficult to trace a single gene for each behavioral characteristic.

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