ENV100Y5 Lecture Notes - Lecture 4: Disruptive Selection, Adaptive Radiation, Monteverde

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7 Feb 2016
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ENV100Y5 Full Course Notes
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Monteverde, costa rica last observation in 1989; declared extinct in. Natural selection produces adaptations natural selection individuals vary (different genotypes) not all individuals will survive to reproduce success is usually not random parents pass traits on to offspring natural selection produces adaptations environment exerts selective pressure. Adaptation = a trait that promotes reproductive success. Mutations = accidental changes in dna that may be passed on to offspring provide the genetic variation on which natural selection acts. Directional selection: drives a feature in one direction. Stabilizing selection: extremes are selected against: disruptive selection: traits diverge in two or more directions adaptive radiation: Population = a group of individuals of a species that live in the same area new species. Allopatric speciation: species formation due to physical separation of populations. Sympatric speciation = populations become reproductively isolated within the same area. Extinction = the disappearance of a species from.

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