List the five conditions that can disturb genetic equilibrium in a population open study

Genetic equilibrium describes the condition of an allele or genotype in a gene pool (such as a population) where the frequency does not change from generation to generation.However, there are conditions or factors that may alter or disturb the genetic equilibrium in a population.These conditions include; 
Non-random mating
small population size
immigration or emigration
Mutations (spontaneous random changes that occur in the genome)
Natural selection.