BIOL 1020 Study Guide - Final Guide: Cyanide Poisoning, Natural Selection, Adaptive Radiation
7 Aug 2014
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A small number of birds arrive on an island from a neighboring larger island. This small population begins to adapt to the new food plants available on the island, and their beaks begin to change. About twice a year, one or two more birds from the neighboring island arrive. You will form a new population by taking some individuals from a source population and isolating them so the two populations cannot interbreed. She hypothesizes that the population is experiencing: disruptive selection: a farmer uses triazine herbicide to control pigweed in his field. For the first few years, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed, no matter how often he applies triazine. Trying a different herbicide: many crustaceans (e. g. , lobsters, shrimp, and crayfish) use their tails to swim, but crabs have reduced tails that curl under their shells and are not used in swimming.
