1. Chapter 24 The Origin of Species (cont.)

2. Questions to ponder Natural hybridization is common and hybrids are not uniformly unfit, they are genotypic classes that are less, equally or more fit than their parental taxa. Some scientists think that hybridization could generate biological diversity. How? Hybridization is common when populations invade new environments. Why? Caulerpa taxifolia hybrid Alexande Meinesz

3. 1- Do you have practice or old exam for study use in order to grasp an idea of how your tests will be formatted? 2-If there are questions such as the “chick discussion” on the test, is it safe to say that you do agree with whichever statement, but you don’t know if there are any factors that may cancel it? 3- Is a hybrid always a new species or can they breed back to their parent species? 4- Are mating habits in species inherited or are they a consequence of the environment? 5- How much genetic difference does there need to be to consider two populations different species? SOME questions from January 18th

4. Modes of Speciation (based on how gene flow among populations is initially interrupted) 1- How would you characterize each mode of speciation? Fig. 24.6

5. Fig. 24.7 Allopatric Speciation

6. Fig. 24.11 Adaptive Radiation Isolation and occasional dispersal. Evolution of many diversely adapted species from a common ancestor.

7. Fig. 24.14 Sympatric Speciation

8. menua Resident Transient P. Stap Orcinus orca R. Baird unknown Fig. 24.16 Sympatric Speciation

9. Tempo of Speciation 3- How do you characterize each model for the tempo of speciation? Fig. 24.17

10. 4- What is the difference between microevolution and macroevolution? 5- How could complex structures such as eyes evolve? Mechanisms of macroevolution

11. 6- Allometric growth determines the proportion of the body due to the different growth rates of different body parts. How can it act as mechanism of macroevolution? Mechanisms of macroevolution Fig. 24.19

12. 7- Is evolution goal oriented. Why? Fig. 24.24