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We explore genetic diversity within populations in population genetics, examining this variation and predicting changes in the frequencies of genes and alleles in populations across time.

Option (a), The effect of selecting factors on allele frequencies in a population over time. Population genetics is a branch of genetics that helps evolutionary biologists understand genetic changes within and across populations. Adaptation, speciation, and population structure are all examined throughout the genetic research in order to provide a more in-depth look at variance. As a result, population genetics can help explain why allele frequencies in a population shift over time. As a result, the correct answer is (a).

(b) The genetic basis of a population-wide trait is provided. Modern evolutionary synthesis relies heavily on population genetics. However, it is not included in a large-scale trait analysis. It's the incorrect response.

(c) Whether or not a characteristic has a genetic basis is stated. Any population's evolution may be determined by looking at changes in allele frequencies rather than studying qualities with a genetic foundation. It's the incorrect response.

(d) It is determined by a population's degree of inbreeding. Changes in allele frequencies in a population and this population of freely interbreeding individuals are explained by the words " allele frequency " and " population ". However, population genetics does not investigate the degree of interbreeding in a population. It's the incorrect response.