Articles > Genetic drift definition – quiz Genetic drift definition – quiz Quiz Choose the best answer. 1. The process of change in the frequency of an allele (gene variant) in a population over time. Genetic frequency Genetic mutation Genetic drift 2. What does genetic drift change over time? Gene pool Genetic mutation Genetic flow 3. The decrease in the number of individuals in a population, e.g. due to a natural disaster Population bottleneck Founder effect Natural selection 4. A small number of individuals leave their population to start a new colony Population bottleneck Founder effect Natural selection 5. The second phase of a subdivided population adaptation process, following genetic drifting Population bottleneck Founder effect Natural selection Send Your Results (Optional) Your Name To Email Time is Up!