The Four Types of Natural
Selection
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Exploring 4 Types of Natural Selection: Stabilizing, Directional, Disruptive, and Sexual, Study notes of Evolutionary biology
An introduction to the four types of natural selection: Stabilizing, Directional, Disruptive, and Sexual. Each type is explained through examples and accompanied by group activities for further exploration. Stabilizing selection occurs when extreme characteristics decrease survival chances, Directional selection favors extreme characteristics, Disruptive selection favors the most extreme traits, and Sexual selection involves physical differences between genders. The document concludes with an explanation of the Hardy-Weinberg Principle and its role in determining allele ratios.
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The Four Types of Natural
Selection
A. Stabilizing Selection
- Where the organisms with
extreme characteristics are less
likely to survive.
- Example: Here in Springfield a
white rabbit or a black rabbit would
more likely get eaten by a predator
rather than a brown rabbit.
Group Work
- With your group, use Internet resources to
come up with your own example.
Thoroughly explain your example.
- With your group draw a graphical
representations of this type of selection.
B. Directional Selection
- Where an organism with extreme
characteristics are more able to
survive than those in the middle
- Examples:
- The giraffe with the longest neck gets
more food and is considered more fit
- The white rabbit that lives in the
arctic is more camouflaged and is
more likely to not be eaten
Group Work
- With your group, use Internet resources to
come up with your own example.
Thoroughly explain your example.
- With your group draw a graphical
representations of this type of selection.
C. Disruptive Selection
- The most extreme traits are the
most likely to survive and
reproduce. The “average” types
have a harder time surviving &
reproducing.
- Examples: Water snakes on the
shore of Lake Erie – Snakes on the
mainland that live in grass habitats
have brown skin and snakes that
live on the islands live on the rocky
shores and have gray skin.
Group Work
- With your group, use Internet resources to
come up with your own example.
Thoroughly explain your example.
- With your group draw a graphical
representations of this type of selection.
Group Work
- With your group, use Internet resources to
come up with your own example.
Thoroughly explain your example.
- With your group draw a graphical
representations of this type of selection.