What happens if a population is in hardy-weinberg equilibrium apex?

I think a relative frequency of alleles or genetic variation will remain unchanged for generations. For example if there is a 1 percent genetic variability in an organism of first generation, then the genetic variability in an organism of second generation will also be approximately 1 percent. There will not be a rapid increase in genetic variations. Mutation will not occur or if occur then it will be at the rate of equilibrium. 

Plants, sunlight, growth and artificial sunlight