Natural Selection Discussion

Created by Lacey Conrad

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10 slides

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Evolution"Nothing in biology makes sense except in the light of evolution."
-Theodosius Dobzhansky

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According to Wikipedia:Evolution is [the] change in the heritable characteristics of biological populations over successive generations. Evolutionary processes give rise to biodiversity at every level of biological organisation, including the levels of species, individual organisms, and molecules.

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Natural Selection is...A mechanism of evolutionary change.

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Components of natural selection:Variation in traitsDifferential reproductionTraits must be heritable

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Examples

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AdaptationA genetic trait that confers an advantage and leads to improved fitness and reproduction.

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Adaptation vs. AcclimationMimicry
Toxin production
Echolocation
Often derives from an adaptation.
Examples:
Perspiring
Shedding of fur

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VariationWithout genetic variation, new traits cannot arise.

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Sources of Genetic VariationMutations
Gene flow
Sexual reproduction

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Example of Genetic Variation From Sexual Reproduction
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