Evolution Selection Natural vs. artificial Fitness Galapagos Finch Directional, Stabilizing, Disruptive Selection Polymorphism = several forms of a species.

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Presentation transcript:

Evolution Selection Natural vs. artificial Fitness Galapagos Finch Directional, Stabilizing, Disruptive Selection Polymorphism = several forms of a species in same habitat Microevolution vs. Macroevolution Microevolution: change in allele frequency Macroevolution: formation of new species

Field Assistants

Chesapeake Bay Retrievers= +

English Peppered Moth Example

Before industrial revolution After industrial revolution English Peppered Moth Example

Darwin’s 2 Major Ideas Variation within an species (organisms of the same species do not look exactly alike) Not all the offspring produced survive (there is a struggle for existence)

Macroevolution: formation of new species Allopatric Speciation: formation of new species due to geographic (physical) barrier Sympatric Speciation: formation of new species due to genetic mutation or reproductive isolation (although they occur together) Adaptive Radiation: formation of new species due to new opportunities (niches) i.e. islands