Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Hologenome theory of evolution wikipedia , lookup
Extinction event wikipedia , lookup
Catholic Church and evolution wikipedia , lookup
Transitional fossil wikipedia , lookup
Evolutionary history of life wikipedia , lookup
Genetics and the Origin of Species wikipedia , lookup
Paleontology wikipedia , lookup
Chapter 17-4: Patterns of Evolution Essential Question: What are 5 important patterns of macroevolution? Mass extinctions Several mass extinctions shown in fossil record Effect is to leave many habitats open for surviving species Often a burst of evolution follows mass extinctions Adaptive radiation Single species evolves into several different forms that live in different ways Convergent evolution Unrelated organisms that look remarkable similar to each other Cause is both species are evolving in similar environments Selection pressures are similar on traits Ex: sharks and dolphins Coevolution 2 species evolve in response to changes in each other over time Ex: flowers & pollinating animals Poisonous plants & resistent insects Punctuated equilibrium Modification of Darwin – he was a “gradualist” Fossil record indicates long periods of little evolution “punctuated” with periods of rapid change in species