My pets birds. I have different types of birds European finch Australian finch African finch.
Evolution Selection Natural vs. artificial Fitness Galapagos Finch Directional, Stabilizing,...
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Transcript of Evolution Selection Natural vs. artificial Fitness Galapagos Finch Directional, Stabilizing,...
![Page 1: Evolution Selection Natural vs. artificial Fitness Galapagos Finch Directional, Stabilizing, Disruptive Selection Polymorphism = several forms of a species.](https://reader036.fdocuments.in/reader036/viewer/2022062519/5697c02b1a28abf838cd8440/html5/thumbnails/1.jpg)
Evolution
• SelectionNatural vs. artificialFitnessGalapagos FinchDirectional, Stabilizing, Disruptive SelectionPolymorphism = several forms of a species in same habitat
• Microevolution vs. MacroevolutionMicroevolution: change in allele frequencyMacroevolution: formation of new species
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FieldAssistants
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Chesapeake Bay Retrievers=
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![Page 5: Evolution Selection Natural vs. artificial Fitness Galapagos Finch Directional, Stabilizing, Disruptive Selection Polymorphism = several forms of a species.](https://reader036.fdocuments.in/reader036/viewer/2022062519/5697c02b1a28abf838cd8440/html5/thumbnails/5.jpg)
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English Peppered MothExample
![Page 7: Evolution Selection Natural vs. artificial Fitness Galapagos Finch Directional, Stabilizing, Disruptive Selection Polymorphism = several forms of a species.](https://reader036.fdocuments.in/reader036/viewer/2022062519/5697c02b1a28abf838cd8440/html5/thumbnails/7.jpg)
Before industrial revolution After industrial revolution
English Peppered Moth Example
![Page 8: Evolution Selection Natural vs. artificial Fitness Galapagos Finch Directional, Stabilizing, Disruptive Selection Polymorphism = several forms of a species.](https://reader036.fdocuments.in/reader036/viewer/2022062519/5697c02b1a28abf838cd8440/html5/thumbnails/8.jpg)
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)
![Page 9: Evolution Selection Natural vs. artificial Fitness Galapagos Finch Directional, Stabilizing, Disruptive Selection Polymorphism = several forms of a species.](https://reader036.fdocuments.in/reader036/viewer/2022062519/5697c02b1a28abf838cd8440/html5/thumbnails/9.jpg)
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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