The Evidence for Evolution. Chapter 21. Evidence of Natural Selection. Darwin collected a closely related group of 14 finch species in the Gal á pagos Islands All were similar except for beak characteristics Darwin hypothesized that different beak shapes were related to food gathering
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
The Evidence for Evolution
Darwin collected a closely related group of 14 finch species in the Galápagos Islands
- Droughts: birds with deeper, more powerful beaks survived better
- Normal rains: average beak depth decreased to its original size
Evidence that natural selection alters beak shape
Selection against melanism
Artificial selection in the laboratory
Corn looks very different from its ancestor
Domestication of silver foxes are a result of artificial selection
Can selection produce major evolutionary changes?
Breeds of dogs: The differences among dog breeds are greater than the differences displayed among wild species of canids.
of life through
Fossil of Archaeopteryx
Whale “missing links”
Evolutionary change in body size and toe reduction of horses
Homology of the bones of the forelimb of mammals
Anatomical Evidence for Evolution
Developmental similarities reflect descent from a common ancestor
Eyes of vertebrates
Eyes of Mollusks
Vestigial structures of a whale
Convergence among fast-swimming predators