____ is the cumulative change in the heritable characteristics of a population. ____represent the sum total of alleles for all GENES present in a population. ____ represent the prevalence of a particular ALLELE in a population. ____ is the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population. ____ is the change in the frequency of an existing gene variant in a population due to random sampling of organisms. ____ happens when the size of a population is severely reduced.

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