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

Allopatric Sympatric

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 Review1. 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

Patterns of Evolution

Patterns of Evolution Coevolution

Variation in Morphology

TIME

Patterns of Evolution Coevolution