Quiz Tomorrow! 6. I can explain the processes of macroevolution and recognize examples. 7. I can analyze a phylogenetic tree and explain evolutionary relationships. 8. I can contrast Darwin and Lamarck’s ideas about changes in organisms over time. 9. I can describe the conditions required to be considered a species. Darwin vs Lamarck and Speciation LT 8 – I can contrast Darwin and Lamarck’s ideas about changes in organisms over time. LT 9 – I can describe the conditions required to be considered a species. Darwin vs Lamarck Darwin Lamarck Variation Use and disuse Inheritance Transmission of acquired characteristics Differential survival Increasing complexity Extinction No extinction Speciation Speciation is the formation of a new species A species is a group of organisms that are closely related and that can produce fertile offspring. Speciation can begin with the separation of populations of the same species. Speciation Accumulated differences between populations is called divergence and can lead to a formation of a new species. Two types of Speciation Allopatric Speciation Sympatric Speciation Allopatric Speciation Occurs when a species separate into two separate groups that are isolated from each other. Physical Barrier Also known as geographical isolation Impossible to breed with one another Allopatric Speciation Allopatric Speciation Sympatric Speciation Occurs when there is not a barrier to prevent members of a species from mating with another. Close proximity Also known as reproductive isolation Something seems to develop spontaneously Sympatric Speciation Exit Slip – Review 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. What are the processes of macroevolution? What can a phyogenetic tree tell us? Explain the difference between Lamarck and Darwin’s ideas? Describe speciation. What is allopatric speciation? What is sympatric speciation? Differentiate between gradualism and punctuated equilibrium. Explain adaptive radiation. What are examples? What are the two types of mimicry? Describe the process of extinction. What are examples of organisms that have gone extinct?