The Formation of New Species

Isolation of Subpops  Mechanisms of evolution cause isolated subpops to diverge

Allopatric Speciation  Geographic isolation prevents interbreeding

Adaptive Radiation  A series of allopatric speciation events

Sympatric Speciation  Reproductive isolation prevents interbreeding  May be pre- or postzygotic AllopatricSympatric

Prezygotic Isolation  Habitat

Prezygotic Isolation  Behavioral

Mating Season for Group A Mating Season for Group B Prezygotic Isolation  Temporal J F M A M J J A S O N D

Prezygotic Isolation  Mechanical

Prezygotic Isolation  Gametic

Postzygotic Isolation

Speciation Review 1. Studying : good grades :: _______:speciation 2. Contrast microevolution and macroevolution. 3. What type of isolation must exist in a case of allopatric speciation? 4. How does a temporal barrier lead to speciation, and what type of speciation would this be?

Patterns of Evolution  Divergent Variation in Morphology TIME

Patterns of Evolution  Convergent Variation in Morphology TIME

Patterns of Evolution

 Coevolution Variation in Morphology TIME

Patterns of Evolution  Coevolution