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

7. Postzygotic Barriers Reduced Hybrid Viability Reduced Hybrid Fertality Hybrid Breakdown

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