Well, you have to be able to understand different aspects of evolution. In this case, there are 2 to consider:
1) Gradualism (Proposed by Darwin)
2) Punctuated Equilibrium (Gould and Eldredge)
In gradualism, the idea is pretty much that over time, we constantly and consistently came to be who we are. Butterflies today are who they are today because of constant changes over time. I guess you can think of it as one little thing happening at a time to make one whole new big picture (or in this case, organism).
In punctuated equilibrium, it's not constant over time. It proposes pretty much that we are who we are today because of set intervals of time where evolution occurred. For example, many years ago, we would have been apes. It followed for 2000 years then in a 10 year interval, we became another form, then 6000 years later, in a random 15 year interval, we became a closer form of human.
Hope that clears things up..
MG
Punctuated Equilibrium, I believe is the answer.
It is called Punctuated Equilibrium. Some Evolutionary apologists, notably Richard Dawkins, have down played this aspect of Neo-Darwinistic theory.
Punctuated equilibrium
This is the idea called punctuated equilibria, by paleontologists Stephen Jay Gould and Niles Eldredge. It explains the patterns seen in the fossil record.
Yes. Evolution via punctuated equilibrium still depends on natural selection. In punctuated equilibrium there are long periods in which most species are well-suited to their environments, and so there is is little selective pressure to change. These periods are punctuated by times of more rapid environmental change and greater stress, which results in greater selective pressure for populations to change.
Punctuated Equilibrium, I believe is the answer.
Punctuated equilibrium
Punctuated equilibrium
Punctuated Equilibrium - album - was created on 2009-01-26.
Punctuated equilibrium is a theory in evolution that suggests long periods of stability with sudden bursts of significant change. Therefore, gradual and continuous evolution is not a characteristic outcome of punctuated equilibrium.
over several thousand years the birds descendants evolve webbed feet and begin to feed on fish. is this an example of gradualism or punctuated equilibrium?
Punctuated Evolution or equilibrium
It is called Punctuated Equilibrium. Some Evolutionary apologists, notably Richard Dawkins, have down played this aspect of Neo-Darwinistic theory.
Punctuated equilibrium.
No difference.
Punctuated equilibrium predicts that a lot of evolutionary change takes place in short periods of time tied to speciation events.
Punctuated equilibrium