Final answer:
The magnitude of change in a population depends on genetic variation, selection pressure, mutation rate, and genetic drift.
Step-by-step explanation:
The magnitude of change in a population depends on genetic variation and selection pressure as well as mutation rate and genetic drift. Genetic variation refers to the diversity of alleles and genotypes within a population, while selection pressure determines which traits are advantageous and therefore more likely to be passed on. Mutation rate and genetic drift introduce new genetic variation into a population through random processes.