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Skip Navigation LinksKCC Home > Academic Departments > Biological Sciences > Bio14 > Lesson 3-The Origin of Species

Lesson 3 The Origen of Species

Self Study Test

I. General facts

Paterns of speciation:

A. Anagenesis

B. Cladogenesis

II. What is a species?

A. Definition: biological concepts

B. Reproductive isolation:

1. Prezygotic barrier

a. Habitat isolation

b.Behavioral isolation

c. Temporal isolation

d.Mechanical isolation

e. Genetic isolaion

2. Postzygotic barrier

a. Reduce hybrid viability

b. reduce hybrid fertiity

c. Hybrid breakdown

C. Limits of biological species concepts

III. Mode of speciation

A. Allopatric speciation

1. Definition

2. Mode (Through the genetic drift, example of:)

a. Ring species

b. Fruit fly (prezygotic)

c. Monkey flower

B. Sympatric speciation

1. Definition

2. Mode

a. In plants (polyploidy and allopolyploidy)

b. In animals (wasps in fig pollination and fish in Victoria Lake)

C. Models of speciation

1. Gradualism

2. Punctuated equilibrium

IV. From species to macroevolution

A. Most evolutionary novelties are modified version of older structures

1. Example of eye

2. Example of feather

B. "Evo-Devo": Genes that control the development

1. Heterochrony

2. Homeotic genes

 

 

 
 
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