Patterns of Evolution and Anatomical Structures

Convergent analogous structures Ostriches (birds) and giraffes (mammals) are both native to the savannahs of Africa. They share the same characteristic of a very long neck. Divergent Adaptive radiation homologus structures various beak shapes on different species of finches The beaver in North America and the capybara in South America share a common ancestor, but have evolved over time to look different Fins on sea turtles and legs on land turtles Coevolution Two species evolve at the same time Dependent relationship between two species must be present Bees don’t see red, but do see yellow, blue, and ultra-violet light. Thus, bee-pollinated flowers are mostly yellow or blue with UV nectar guides (landing patterns) to guide the bee. They usually have a small, narrow floral tube to fit the tongue-length of that species of bee Match the description to the correct structure Homologous Structures have different functions but can be found in organisms that have a common ancestor Whale fin and alligator leg Divergent evolution Analogous Structures that have the same function but are found in organisms that don't share a common ancestor Wing of a butterfly and wing of a bird Convergent evolution Vestigial A structure that no longer has a function Wisdom teeth and appendix