'Prezygotic barriers' diaporamas de présentation

The Origin of Species

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BIO 3A Fall 2011 Chapter 24 Origin of Species

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BIOL102

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CHAPTER 24

CHAPTER 24. THE ORIGIN OF SPECIES. 1. OVERVIEW. A. Speciation Is defined as the origin of new species (process by which one species splits into two or more species) Is at the focal point of evolutionary theory which must explain how new species originate and how populations evolve

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Chapter 24: The Origin of Species

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Chapter 24

Chapter 24. Species & Speciation. Chapter 24 in a nutshell. Microevolution v. Macroevolution Speciation Prezygotic Postzygotic Gradualism v. Punctuated equilibrium. Species. Morphological species concept Divisions of organisms into discrete units called species

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The Formation of Species

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Speciation

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Origin of Species

Origin of Species. 3/30/09. Fig. 24-3a. Gene flow between populations. Example of a gene tree for population pair A-B. Allele. Population. Gene flow event. 1. B. Allele 1 is more closely related to alleles 2, 3, and 4 than to alleles 5, 6, and 7. Inference: Gene flow occurred. 2. A.

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Evolutionary Biology

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Speciation

Speciation. A species is an interbreeding group of organisms When a population is somehow severed from the parent population and over time its gene pool is altered. Allopatric and sympatric. Allopatric speciation. Isolation is the result of a geographic barrier Ex. Galapagos finches

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