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10 Cards in this Set
- Front
- Back
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Directional Selection *3 things |
1. favors one extreme of a trait in a population. 2. Prunes off the other extreme 3. Results in a shift( increase or decrease in the average (working ) value of a trait in a poulation Ex.) Peppered Moths. |
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Stabilizing Selection |
1. favors the average value of a trait in a population 2. Prunes off the extremes 3. Maintains the status quo 4. think of goldilocks of selection: Only the average is "just right" * 1 to small * 1 perfect * 1 to big |
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Stabilizing Selection: Counterintuitive Points: |
1. Natural Selection does not always work to change things 2. Natural selection still has to be working in order for things to stay the same. 3.Without it, things would change just by chance |
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Disruptive Selection |
1. favors both extremes values of a trait 2. Select against the mean ( middle- range values) 3. Trait distribution has two peaks (bi modal) |
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Directional Selection ( over view) |
Favors one extreme version of a trait over the other extreme and over the mean value in the population shifts. |
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Stabilizing Selection( over view) |
favors the average version of a trait and over time the mean value in the population remains the same |
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Disruptive Selection ( over view) |
favors both extremes and selects against the mean value so over time there are two separate peaks in the distribution. |
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Natural Selection works for the population or individual? |
Individual |
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What is the correct term for " fittest" in the Survival of the Fittest? |
Fittest or fitness= terms of reproductive success |
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What is wrong with this statement " giving organisms what they need"? |
Natural selection does not grant organisms what they need. Mutations are random. And needs existing variation in order to work |
