Let’s Review! Directional Selection

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Presentation transcript:

Let’s Review! Directional Selection Selection towards a single direction Disruptive Selection Selection against the mean (middle) Selection towards extremes Stabilizing Selection Selection towards the mean (middle) Selection against extreme

Do you get it? Directional Selection Disruptive Selection Stabilizing Selection

Evolution Scenarios A. Directional Selection B. Disruptive Selection C. Stabilizing Selection

Evolution Scenarios

Evolution Scenarios A. Directional Selection B. Disruptive Selection C. Stabilizing Selection

Evolution Scenarios

Evolution Scenarios A. Directional Selection B. Disruptive Selection C. Stabilizing Selection

Evolution Scenarios

That brings us to speciation… Speciation: the creation of a new species as a result of evolution. How do you know when you have a new species? They can no longer reproduce in their natural settings!

That brings us to speciation… Rate of Speciation Theories Gradualism Evolution occurs slowly and gradually, with very small changes accumulating over a long period of time until a new species develops. Punctuated Equilibrium Evolution occurs in short, rapid bursts of change followed by long period of no change.

A. Gradualism B. Punctuated Equilibrium Do you get it? A. Gradualism B. Punctuated Equilibrium

A. Gradualism B. Punctuated Equilibrium Do you get it? A. Gradualism B. Punctuated Equilibrium

Let’s Switch Gears…Patterns of Evolution Divergent Evolution Related species becoming more and more different due to living in different types of environments Convergent Evolution Unrelated species becoming similar due to living in similar types of environments Coevolution The simultaneous evolution of two species due to their close interaction/relationship