BIOL 220 Study Guide - Fall 2019, Comprehensive Midterm Notes -
13 Feb 2019
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8/29/18: function, homologous structure - come from a common ancestor (phylogenetic history) Forelimb of a shark, whale, or bat: analogous structure - purely relates to function, evolutionary origins may differ, convergent evolution - distant organisms independently evolving similar traits to adapt to their specific environment. Gliding fish, gliding frogs, & gliding lizards: have different structures to help them glide in the air, but serve the same function. Ex. insect wings & bat wings: homoplasious structure - structures appear similar, but functions and origins may differ. Variation of species and characters have genetic basis: ex. Brown bugs blend into ground which makes it harder for predators to see them, green ones are most likely eaten, brown bugs are most likely able to pass on traits. Proportional changes - proportions of individuals w/ traits able to pass on are more common in population: ex.
