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Transcript
Study Guide
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UNIT VIII
Accelerated Honors Biology
Know Darwin’s Ideas on Evolution:
Evolution-unifying theme/response to current environment
Species change over time
Natural selection
Descent with modification-how modern species arose over time, from earlier life
forms
Artificial selection- wild mustard
Lamarck’s idea-acquire a trait in ones lifetime because of need & pass that trait
to offspring
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Definition of Natural Selection- Differential reproduction Success
Evidence supporting evolution:
o Comparative embryology
o Molecular biology
o Biogeography-distribution of living species
o Comparative anatomy:
o Define:
Homologous structure: wing of bat, whale flipper
Vestigial structures-appendix
 Homology indicates patterns of descent shown on an evolutionary tree
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Define population/specie; pop. Smallest unit to evolve
Gene pool
Mutations- ultimate source of new alleles-genes
Microevolution-causes of evolutionary change
o Natural selection
o Genetic drift- change in gene pool of population- usually from a
disaster
 Bottleneck effect
 Founder effect
o Gene flow
Stabilizing selection
Directional selection
Disruptive selection
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Sexual selection –sexual dimorphism peacock, peahen
Examples of Evolution today: Antibiotic resistant bacteria
Earliest fossil;-what fossils found in which strata
radiometric dating-