Biology CLEP Prep Practice Exam

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What is an example of a stochastic evolutionary process?

Genomic convergence
Gene flow
Mutations
Genetic drift

The correct answer is: Genetic drift

A stochastic evolutionary process refers to a process that is based on random chance rather than predetermined factors. While all of the options listed could potentially play a role in evolution, only genetic drift involves a random change in the frequency of certain genes within a population. Genomic convergence refers to the independent evolution of similar traits in different species, and is not solely based on chance. Gene flow involves the movement and exchange of genes between different populations, but is not considered a stochastic process as it is influenced by external factors such as migration patterns. Mutations are also not considered a stochastic process as they occur randomly but are subject to natural selection and other forces. Therefore, genetic drift is the best example of a stochastic evolutionary process among the given options.