Homologous features Analogous features Vestigial structures

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Presentation transcript:

Homologous features Analogous features Vestigial structures 15.3 Evidence of Evolution Homologous features Analogous features Vestigial structures

Homologous features · Similar features that have same structures but different functions. They come from the same structures in the embryo. · Indicates that different species shared a common ancestor. Ex. P.289 fig. 15-7. Penguin, alligator, human and bat.

Analogous Features · Features which have different structures but similar functions. Shows no common ancestor. Ex. P. 290 wings of hummingbird and wings of humming moth.

Vestigial Structures ·Features which serve no function. Exs. Tailbone, appendix, nictitating membrane. · These features use to be useful to an ancestor. · Whales are probably descended from a land animal. Some whales have vestigial hind legs.

Coevolution *Parasites with their hosts. *Predator with prey. · The change of 2 or more species in close association with each other. *Parasites with their hosts. *Predator with prey. *Tropical bat with its flower it feeds on p. 291

Convergent Evolution vs. Divergent Evolution A. Convergent evolution *Shark and porpoise. They look similar but not closely related. Have analogous fins. Have same phenotypes which means they look the same.

B. Divergent Evolution *Dogs. They all are closely related but look different. 1. Adaptive radiation *many related species evolve from a single ancestor 2. Artificial selection *Breeding for specific phenotypes like in dogs. *Gives a variety of species *Speeds up divergent evolution.