Introduction to Genetic Analysis 19

Introduction to Genetic Analysis 19 - 18 Chapter 1 •...

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Unformatted text preview: 18 Chapter 1 • Genetics and the Organism the environment determines the actual course of devel- opment. Imagine a set of specifications for a house that simply calls for a “floor that will support 300 pounds per square foot” or “walls with an insulation factor of 15 inches”; the actual appearance and other characteristics of the structure would be determined by the available building materials. Model III: genotype-environment interaction In general, we deal with organisms that differ in both genes and environment. If we wish to predict how a living organism will develop, we need to know both the genetic constitution that it inherits from its parents and the his- torical sequence of environments to which it has been ex- posed. Every organism has a developmental history from conception to death. What an organism will become in the next moment depends critically both on its present state and on the environment that it encounters during that moment. It makes a difference to an organism not only what environments it encounters, but also in what sequence it encounters them. A fruit fly (Drosophila melanogaster),...
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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