Get the definition of the next word: Genetics . Include at least 2 sources.

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http://www.thefreedictionary.com/genetics

Copy the three key principles on Darwin and Wallace theory of evolution.

The principle of variation: Random changes in the characterisitics of individuals are being constantly produced in all the population.

The principle of heredity: The individuals of a species are like their progenitors as they inherit their characteristics.

The principle of selection: The environment will select those individuals which accumulate the adventageous variations. By means of heredity, these variations will be extended among the population for successive generation, producing changes in the populations.