Preferred term

genetic drift

Is replaced by

[Henderson's] (1) random changes in gene frequency in small isolated populations owing to factors other than natural selection, such as sampling of only a small number of gametes in each generation. alt. Sewall Wright effect; (2) random nucleotide changes in a gene not subject to natural selection; (3) small changes in the genome of the inﬂuenza virus that cause annual outbreaks but not serious epidemics or pandemics. cf. genetic shift.

http://vocabs.lter-europe.net/EnvThes/msa0492