Evolution is change in the gene frequency of a population over successive generations. Over large spans of time, over many generations, the processes of evolution lead to the descent of different species from a common ancestor. The evolutionary framework provides the central, coherent scientific basis to understand the diversity of life on Earth.
Although the new MCAT has reduced the importance of population biology and ecology for the exam, there is still the requirement to have a basic vocabulary to describe evolutionary processes including understanding fitness, selection, speciation, and the differences between microevolution and macroevolution.
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Conceptual Vocabulary for Evolution