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Interactive presentation plan for: Natural Selection Discussion

Activity overview:

10 slides

Evolution

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

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.

Natural Selection is...

A mechanism of evolutionary change.

Components of natural selection:

Variation in traits

Differential reproduction

Traits must be heritable

Examples

Adaptation

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

Adaptation vs. Acclimation

Mimicry
Toxin production
Echolocation

Often derives from an adaptation.
Examples:
Perspiring
Shedding of fur

Variation

Without genetic variation, new traits cannot arise.

Sources of Genetic Variation

Mutations
Gene flow
Sexual reproduction

Example of Genetic Variation From Sexual Reproduction

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