Hardy-Weinberg Principle.

No statements, but a few of the Hardy-Weinberg conditions.

Random mating.

No gene flow.

No natural selection.

p is the value of an allele frequency.

Genetic equilibrium is a theoretical concept used to study the dymamics of single alleles in the population gene pool.

In practice, there is no situation in which allele frequencies do not drift to some degree. Large populations may slow drift down, but there will still be drift.

Genotype frequencies in a population.