seniorGenetic Algorithms
What is a genetic drift in Genetic Algorithms?
Updated May 16, 2026
Short answer
Genetic drift is the random loss of diversity in a GA population over time.
Deep explanation
Genetic drift occurs when allele frequencies change due to random sampling effects rather than fitness advantages. In GA, this means some genes become dominant purely by chance, especially in small populations. Over time, drift reduces genetic diversity, increasing the risk of premature convergence and limiting exploration of the search space.
Real-world example
In small-scale recommendation systems, random user behavior can bias the model toward suboptimal patterns.
Common mistakes
- Confusing genetic drift with selection pressure
- drift is random, not fitness-driven.
Follow-up questions
- How does population size affect drift?
- How can drift be controlled?