BIOL 1503 Chapter : Bio 1503 Ch 24
Document Summary
Describe examples of adaptive radiation in the gal pagos and hawaiian archipelagoes: 9. Explain how polyploidy can cause reproductive isolation: 10. describe how cichlid fishes may have speciated in in lake victoria, 11. define adaptive radiation and describe the circumstances under which adaptive radiation may occur, 12. Explain in general terms how a complex structure can evolve by natural selection: 13. define exaptation and illustrate this concept with an example. This can happen through halted gene flow. We have to have isolation for speciation to occur. Speciation is a splitting event that creates two or more distinct species from a single ancestral group. Two basic patterns of evolutionary change can be distinguished. Anagenesis the way that darwin viewed speciation- one group and over time changed into a new species. Cladogenesis a group may break off and evolve but the parent species is still there: what is a species, appearance can be misleading.
