genetic drift

https://doi.org/10.1351/goldbook.14712
Evolutionary process of change in the allele frequencies in a population due to random changes in the frequency by which different alleles are transferred to the next generation.
Note: In small populations, genetic drift may result in extinction of some alleles leading to evolutionary change over time.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 890 [Terms] [Paper]