AP Biology / Unit 7: Natural Selection
7.1 Introduction to Natural Selection
Notes
Natural selection: individuals with heritable traits that help them survive and reproduce leave more offspring, so those traits become more common.
- Fitness = reproductive success.
- Variation must exist and be heritable.
Practice
In natural selection, fitness means:
Offspring that survive.
Natural selection acts on:
Traits the environment "sees."
Which is required for natural selection?
Selection needs variation to act on.
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