Monday, January 21, 2013

Big Idea 1, #5 and #26. Analogous structure and homologous structure. Analogous structure is a structure in different species having similar function but not from the same evolutionary ancestor. This Fancy Canary is an example of this. Like a fruit fly, it has wings for flight, but neither share a common ancestor. Homologous structure, on the other hand, is the same thing, only both species do share a common ancestor. The red claw crab exemplifies this, because like other clawed crustaceans, its claws are for defense and food gathering. Crabs and lobsters share a common ancestor.

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