BIOL 190 Lecture Notes - Lecture 36: Phyletic Gradualism, High Evolutionary, Macroevolution

• School: University of San Diego
• Department: Biology Courses
• Course: BIOL 190
• Professor: Leavitt, Dean

Document Summary

There is a continuum from micro to macro evolution. Based on ve ngers of evolution (natural selection migration, non-random mating, and population size) Speciation (origination) and extinction (change in numbers over time. Standing diversity - number of species at a time interval. = initial species diversity + originations - extinctions. Ancestral species diversify into a large number of highly specialized descendant species. Adaptive breakthrough evolutionary innovation allowing a new mode of resource exploitation. New land mass: morphological innovation bird wings, jointed appendages, morphology and ecology. Evolutionary rates whales without real teeth, strain crustaceans rate of evolution is a measurement of change in an evolutionary lineage over time. Black labs evolved only after a few thousand years of selective breeding arti cial breeding. Similar evolutionary changes in nature take many millions of years. Opposite of a high evolutionary rate long period of no (or very little) change.