| Front | Allopatric speciation |
|---|---|
| Back | Populations that are geographically separated (mountain or a river) will experience different conditions so the populations will experience different selection pressures so different changes in the allele frequencies could occur. Different alleles will be more advantageous in different populations Allele frequencies will change as mutations occur independently in each population Changes in allele frequencies will lead to differences in the gene pools of the populations causing changes in the phenotype frequencies. Eventually, individuals from the different populations will have changed so much that they wont be able to breed with one another to produce fertile offspring and so they become reproductively isolated |
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