Explain why genotypes frequencies usually don't remain constant from generation to generation?

This is because, naturally, a population can hardly observe the 5 assumptions by Hardy Weinberg to ideally become a population at equilibrium. For genotypes frequencies to remain constant from generation to generation, the following should be observed in the population;

No emigration or immigration – gene flow
No mutations
The population should be infinitely large
There should be random mating across the population
No natural selection pressures

Hardly any population can hold these assumptions true which is the reason that populations constantly evolve (which means there are changes to gene frequencies per generation) with changes in the environment. In a Hardy Weinberg ideal population, there would be no evolution.

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