Question

Natural selection, sexual selection, mutations, competitions, the survival of the fittest, isolation, and Hardy Weinberg's principles.

Are there gene pools that follow these five rules and don't evolve?

Answer 1

As a population of a given species reproduces, certain variants of a gene, known as alleles, can become more prevalent in that population as those alleles prove advantageous for survival.Peppered moths provided the most famous example of this process in action.The evolution of the peppered moth is an example of natural selection at work; the genetic variation most suitable to a given environment is the one that thrives.But not every species is fortunate enough to have a rich and varied gene pool. For instance, a catastrophic event like an earthquake or rapid climate change might wipe out the majority of a species, leaving only a few genetically similar members to carry on.If, on the other hand, a species has little genetic variation, that species may not be able to adapt to changing environmental conditions. Genetic drift, another significant mechanism of evolution, also depends on significant genetic variation to operate though in the case of genetic drift, chance determines which alleles become prevalent.That means that, even if a species had no genetic diversity at all, it could still evolve.Mutation happens at a certain rate, and then selection or other systems can work on it, depending on the environment.Thus,When a population is in Hardy-Weinberg equilibrium for a gene, it is not evolving, and allele frequencies will stay the same across generations.