The Origin of Species - Mt. San Antonio College

The Origin of Species - Mt. San Antonio College

The Origin of Species Species Biological Species

Ring Species Barriers

Prezygotic Habitat Isolation Behavior Isolation Temporal Isolation

Mechanical Isolation Gametic Isolation Postzygotic

Hybrid Sterility Hybrid Inviability Hybrid Breakdown

Habitat Isolation Behavior Isolation

Behavior Isolation Temporal Isolation

Mechanical Isolation Gametic Isolation

Hybrid Sterility Hybrid Inviability

Hybrid Breakdown Modes of Speciation

Allopatric Speciation Adaptive Radiation

Sympatric Speciation Autopolyploidy

Sympatric Speciation Allopolyploidy Macroevolution

Gradualism Also called Neodarwinism

Small changes over time Supporter: Ernst Mayr

Punctuated Equilibrium Supporters: Niles Eldredge & Stephen J.

Gould Speciation occurs in episodic events large periods of time with

little change and short periods of time with large changes

Origin of Evolutionary Novelty Most novelties are modified versions of older structures

preadaptation Evo-devo Evolutionary Biology

and Developmental Biology working together

Homeotic Genes Hox Genes- position information

Evolutionary Trends Evolutionary trends are not goal oriented

Adaptive Radiation The emergence of numerous species

from a common ancestor introduced into an environment, presenting a diversity

of new opportunities and problems

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