Population genetics is the study of:

how selective forces change the allele frequencies in a population over time

the genetic basis of population-wide traits

whether traits have a genetic basis

the degree of inbreeding in a population

how selective forces change the allele frequencies in a population over time

Explanation:

Population genetics is a mathematical field of biology that studies the genetic makeup of populations and the changes in population composition that result from the influence of various factors. This science is responsible for studying how selective forces change allelic frequencies in a population over time.

Factors that influence genetic diversity within a set of genes include population size, mutation, genetic drift, natural selection, environmental diversity, migration, and nonrandom mating patterns. In this area of genetics are also studies phenomena such as adaptation, speciation, population subdivision and population structure.