However, a more recent and better-supported version of this model is the nearly neutral theory, where a mutation that would be effectively neutral in a small population is not necessarily neutral in a large population.
Hak id ijja awen, majrad eynayan hullan tolas iknan lakkumat i ich-ikil wen eqqal mirda wan muxayid edg s inta as amutti wan muxayid daɣ ichaɣib andarran war eqqel muxayid daɣ ichaɣib maqqoran