Final answer:
The sum of all gene copies at all gene loci in all individuals in a population defines a gene pool. The gene pool consists of all the different alleles for each gene that exist in the population. Population geneticists use mathematical models to study allele frequencies.
Step-by-step explanation:
The sum of all gene copies at all gene loci in all individuals in a population defines a gene pool.
The gene pool consists of all the genes of all the members of the population and includes all the different alleles for each gene that exist in the population. Population geneticists represent different alleles as different variables in their mathematical models to study allele frequencies.