BIOL 3040 Chapter : BIOL 3040 9 5
Document Summary
Adaptation: trait evolved to serve the function it serves today. Exaptation: trait evolved to serve a function different than the trait now serves today. Human soft-spot: allows some flexability in the skull for passage through the birth canal. Not as present in birds and reptiles, which need only to release themselves from eggs. Suture structure: evolutionarily advantages possibly by allowing for brain to grow and the skull to grow along with it rather than having the skull bound by the size at birth. Hypothesis: body covering for thermoregulation; pigmentation deposited in the dinosaur feathers; ergo, sexual selection or intrasexual competition. Examples of gene sharing: lens crystallins with separate enzymatic functions. Crysatllins can serve as enzymes in various organisms (exaptation) Gene duplication: aldosterone-binding receptor appears before adaptation of aldosterone synthesis. Phylogeny: the branching pattern of relationships of populations in a group or taxon. Monophyletic group: common ancestor and all of its descendents.
