Divergent A daptive Radiation Gradual and Punctuated Coevolution When a species diverges over time into two different species resulting in a species becoming less like the original one ID: 376453
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Convergent – DivergentAdaptive Radiation Gradual and PunctuatedCoevolution Slide2
When a species diverges over time into two different species, resulting in a species becoming less like the original one- Live in different ways than the common ancestor- Caused by migration or nearby extinction of a nearby environment- Prime example are the dinosaurs
Divergent EvolutionSlide3
When unrelated organisms evolve similarities when adapting to similar environments- Live in the relatively same way as each other- Emus, rheas, and ostriches are prime examples of convergent evolutionNo Common ancestor involved
Convergent Evolution:Slide4
The importance of these types of evolution is generating variation, as well as species performing their niche in their environment. As every species has a role to play, these types of evolution ensure that these are carried out. Significance…..Slide5
An adaptive radiation generally means an event in which a lineage rapidly diversifies, with the newly formed lineages evolving different adaptations. Different factors may trigger adaptive radiations, but each is a response to an opportunity. Best example-Darwin’s Finches
Adaptive RadiationSlide6
Gradual- slow changes to an organism that accumulate over timePunctuated- long periods of stability with abrupt evolutionary changes happening rapidly.
Gradual equilibrium
vs
punctuated
equilibrium:
The rate at which evolution movesSlide7Slide8
Co evolutionTwo organism evolve together due to a dependence on each other. The term coevolution is used to describe cases where two (or more) species reciprocally affect each other’s evolution. So for example, an evolutionary change in the morphology of a plant, might affect the morphology of an herbivore that eats the plant, which in turn might affect the evolution of the plant, which might affect the evolution of the herbivore...and so on.
http
://evolution.berkeley.edu/evosite/evo101/IIIFCoevolution.shtmlSlide9
Just some extra slide…..Slide10
Polypoloidy in plantsTwo Anemone speciesOne is polyploidy
Multiple sets of chromosomes due to non separation of chromosomes in meiosis.
Affects evolution of a new species because the different organisms will not cross-pollinate.
Aneuploidy
- an abnormal number of chromosomes.
The number of chromosomes are not an exact multiple for the
monoploid
number. Can be too many or too few chromosomes.