If a population goes from an allele frequency of 0.12 A & 0.88 a to 0.23 A & 0.77 a in the course of seven generations, we can conclude the population is evolving.

Allele Frequency

The proportion of a specific allele variant among all allele variations for the same gene in a given population.

Evolving

The process by which species undergo gradual change over time through variations and natural selection.