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Unformatted text preview: The point is that morphological rates of evolution can be very different in both tempo and mode in different lineages of organisms. Some of the between-group differences are real and some are an artifact of temporal scale . Gingerich recorded rates of change in selection experiments, colonization events, post-Pleistocene changes and long-term changes (domains I, II, III, IV in table figure below) and plotted them against the measurement interval in years. The clear relationship indicates that changes measured over short time spans exaggerate the changes one might predict if carried out for a long time. There are reversals of morphological trends and periods of no change (="stasis"; next lecture) that reduce the rate of change when averaged over a long time period....
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This note was uploaded on 11/06/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.
- Fall '10