Speciation

What do we mean by "species"?

Allopatric speciation

Part of a population becomes isolated

See genetic divergence over time

Separation is maintained even without the barrier

Reproductive isolating mechanisms prevent interbreeding

Pre-mating:

Behavioral isolation

Temporal isolation

Ecological isolation

Mechanical incompatibility

Post-mating:

Gametic incompatibility

Hybrid inviability

Hybrid infertility

Evidence of speciation