A biologist from TECFA @ IMD 13 nov 2001 Allopatric speciation as model of evolution in distributed teams allopatric-speciation model for groups > spéciation > divers A few notable phenomena : Genetic drift In very small (statistically speaking) populations, random changes influence flux of genes. Fonder effect In populations stemming from a limited number of individuals,the total number of different genes (alleles) is reduced and total diversity is limited to the combinations of the genes present in the Fondators. (Geno / pheno) Ex : Indians of america : no blood group B Effects of differing environnements Circumstances of evolution not same in two places. Ex Islands, Galapagos   < ^ >