'Fertile hybrids' diaporamas de présentation

Chapter 16

Chapter 16 . The Origin of Species . Chapter 16 At a Glance . 16.1 What Is a Species? 16.2 How Is Reproductive Isolation Between Species Maintained? 16.3 How Do New Species Form? 16.4 What Causes Extinction? . 16.1 What Is a Species? . Biologists need a clear definition of species

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The Origin of Species

The Origin of Species. Patterns of Speciation. Fossil record indicates two patterns: anagenesis (phyletic evolution) - an unbranched lineage cladogenesis -branching evolution most commot form promotes greater diversity by increasing the number of species. Patterns of Speciation.

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CHAPTER 24 THE ORIGIN OF SPECIES

CHAPTER 24 THE ORIGIN OF SPECIES. Section A: What Is a Species?. 1. The biological species concept emphasizes reproductive isolation 2. Prezygotic and postzygotic barriers isolate the gene pools of biological species 3. The biological species concept has some major limitations

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GRIN Crop Wild Relative Project

GRIN Crop Wild Relative Project. PEO Project initiated October 2008. 2. Identify crop relatives by gene pool status. 3. Prioritized by economic value of crops. 4. Data gleaned from multiple sources. 5. Seek curator/CGC approval of treatment. Gene Pool Classification Criteria.

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Speciation

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Speciation

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