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Speciation Ch 14. What is a species Numerous definitions Biological Species Concept Morphological Species Concept Ecological Species Concept Phylogenic.

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Presentation on theme: "Speciation Ch 14. What is a species Numerous definitions Biological Species Concept Morphological Species Concept Ecological Species Concept Phylogenic."— Presentation transcript:

1 Speciation Ch 14

2 What is a species Numerous definitions Biological Species Concept Morphological Species Concept Ecological Species Concept Phylogenic Species Concept

3 Evolutionary Theories

4 Creating a Species Reproductive Isolation Reproductive Barriers – Prezygotic Barriers – Postzygotic Barriers

5 Prezygotic Barriers Temporal Isolation Habitat Isolation Behavioral Isolation Mechanical Isolation Gametic Isolation

6

7 Postzygotic Barriers Reduced Hybrid Viability Reduced Hybrid Fertality Hybrid Breakdown

8

9 Speciation Emergence of a new species Allopatric vs Sympatric – Creation of reproductive barriers

10 Parent species 2n = 6 Tetraploid cells 4n = 12 1 Diploid gametes 2n = 6 2 Viable, fertile tetraploid species 4n = 12 Self- fertilization 3 Sympatric Speciation Niche separation, sexual selection, habitat differentiation Polyploid

11 Sympatric Speciation Hybrid Polypoid Species A 2n = 4 Gamete n = 2 1 2 Species B 2n = 6 Gamete n = 3 Sterile hybrid n = 5 Chromosomes not homologous (cannot pair) Viable, fertile hybrid species 2n = 10 3

12 Hybrid Zones Regions where different species meet and mate Outcomes – Reinforcement – Fusion – Stability

13 Adaptive Radiation Evolution of diverse species from common ancestor Colonization Extinctions

14 http://www.youtube.com/watch?v=YCoEiLOV 8jc http://www.youtube.com/watch?v=YCoEiLOV 8jc http://www.youtube.com/watch?v=v9i2WYS6 0L4


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