Bio - Unit 3 - Summative Review
Presentation
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Biology
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9th - 10th Grade
•
Medium
+2
Standards-aligned
Karl Bratland
Used 5+ times
FREE Resource
8 Slides • 7 Questions
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Bio - Unit 3 Summative
Review lesson for assessment.
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Multiple Choice
MODEL 1: A plant that is too short may not be able to compete with other plants for sunlight. However, extremely tall plants may be more susceptible to wind damage. Combined, these two pressures select to maintain plants of medium height.
What type of natural selection is this?
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Stabilizing Selection
When selective pressures select against the two extremes of a trait, the population experiences stabilizing selection.
The number of plants of medium height will increase while the numbers of short and tall plants will decrease.
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Multiple Choice
MODEL 2: Imagine a plant of extremely variable height that is pollinated by three different pollinators, one that was attracted to short plants, another that preferred plants of medium height and a third that visited only the tallest plants.
If the pollinator that preferred plants of medium height disappeared from an area, medium height plants would be selected against and the population would tend toward both short and tall, but not medium height plants.
What type of natural selection is this?
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Disruptive Selection
In disruptive selection, selection pressures act against individuals in the middle of the trait distribution. The result is a two-peaked, curve in which the two extremes of the curve create their own smaller curves.
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Multiple Choice
MODEL 3: Using the familiar example of giraffe necks, there was a selection pressure against short necks, since individuals with short necks could not reach as many leaves on which to feed. As a result, the distribution of neck length shifted to favor individuals with long necks.
What type of natural selection is this?
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Directional Selection
In directional selection, one extreme of the trait distribution experiences selection against it. The result is that the population's trait distribution shifts toward the other extreme. In the case of such selection, the mean of the population graph shifts.
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Multiple Select
There are 4 factors of natural selection.
The potential for a population to increase in number is...
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Reproduce
A population can increase in number.
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Multiple Select
There are 4 factors of natural selection.
The competition for food or territory is...
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Competition for Resources
Competing for food, territory, mates, etc.
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Multiple Select
There are 4 factors of natural selection.
Traits have variations and are passed down from parents to offspring is..
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Genetic Variation
Traits have variation caused by sexual reproduction and mutations.
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Multiple Select
There are 4 factors of natural selection.
Reproductive fitness allowing for organisms with the "best" traits to survive is...
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Reproductive Fitness or Success
Organisms that have the best traits for the environment are the most “fit,” and will survive
Bio - Unit 3 Summative
Review lesson for assessment.
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