Concept 2: Descent with Modification

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Presentation transcript:

Concept 2: Descent with Modification You must know: How Lamarck’s view of the mechanism of evolution differed from Darwin’s Several examples of evidence for evolution The differences between structures that are homologous and those that are analogous, and how this relates to evolution The role of adaptations, variation, time, reproductive success, and heritability in evolution

Evidence for Evolution Direct observations Evolution of antibiotic-resistant bacteria

Evidence for Evolution Direct observations Evolution of antibiotic-resistant bacteria The fossil record Past organisms were different, changes have occurred

Evidence for Evolution Direct observations Evolution of antibiotic-resistant bacteria The fossil record Past organisms were different, changes have occurred Homology and Convergent Evolution Homologous Structures: variations on a structural theme: wing, flipper, hand; vistigial

Homologous Structures

Evidence for Evolution Direct observations Evolution of antibiotic-resistant bacteria The fossil record Past organisms were different, changes have occurred Homology and Convergent Evolution Homologous Structures: variations on a structural theme: wing, flipper, hand; vestigial Analogous Structures: similar adaptations to similar environments: fin, flipper; streamlined body

Analogous Structure through Convergent Evolution

Evidence for Evolution Direct observations Evolution of antibiotic-resistant bacteria The fossil record Past organisms were different, changes have occurred Homology and Convergent Evolution Homologous Structures: Variations on a structural theme: wing, flipper, hand Analogous Structures: similar adaptations to similar environments: fin, flipper; streamlined body Biogeography Geographic distribution of species: continental drift from Pangaea

http://www.wimp.com/evolutioneye/ Next class: Checkpoint: Concept 1 and 2