Population geneticists study changes in the nature and amount of genetic variation in populations, the distribution of different genotypes, and how forces such as selection and drift act on genetic variation to bring about evolutionary change in populations and the formation of new species. From the explanation given in the chapter, what answers would you propose to the following fundamental questions? How do we know how much genetic variation is in a population?

Everyone. Let's take a look at this question together in purifying selection, which of the following variation is removed from the population. So let's recall what we know about purifying selection to figure out which of the following is that variation that is removed from the population. So we know that purifying selection is also called negative selection and involves the selective removal of harmful or deleterious mutations. Which means that answer Choice C. Is the correct answer because we know that when we use that purifying selection or that negative selection to remove harmful or deleterious mutations, we're not removing the favorable mutations or the mutations with the least frequency or the highest frequency because we are only removing those deleterious or harmful mutations. So answer Choice C. Is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.