BIO120H1 Lecture Notes - Lecture 8: Melanism, Directional Selection, Gene Flow

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14 Jan 2017
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BIO120H1 Full Course Notes
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BIO120H1 Full Course Notes
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The structure of the orchid from madagascar and the long proboscis of the moth is an adaptation, darwin predicted that there was a moth with a long proboscis, it was found a century later. Fitness: relative genetic contribution of individuals to next generation as a result of differences in viability (survival) and fertility (reproduction. Selective advantage: the individuals that are better adapted to the environment and have a higher fitness. Adaptation: any trait that contributes to fitness by making an organism better able to survive and reproduce (noun) (verb) the evolutionary process that leads to the origin and maintenance of traits. The domesticated breeding of plants and animals. The selection is by humans and has a purpose. Selection is by biotic and abiotic factors and has no purpose. Types of selection: stabilizing average traits are favored, directional one extreme is favored, disruptive favouring both extremes. As seeds became harder the average beak size increased.

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