Random change in allele frequencies with no advantage over existing frequencies describes:

1. Not every change in allele frequency is adaptive. 2. Sometimes allele frequencies within a population change randomly. 3. That change brings no advantage to the population over existing allele frequencies. 4. This is genetic drift, which occurs alongside natural selection. 5. Selection, by contrast, favours particular phenotypes. _Source: OpenStax Biology 2e (CC BY 4.0), Ch 19 'The Evolution of Populations', sections 19.1-19.3_