Natural Selection and Population Change
10th Grade · Science · 85 min
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Learning Objective
I can explain how natural selection leads to changes in populations over time.
- 1
Natural selection is a mechanism of evolution, which is change in a population over time.
- 2
In a particular environment, organisms with traits that allow them to survive and reproduce have higher fitness, and those traits become more frequent in the population.
- 3
Mutations and variations are random, but if they have a positive effect on an organism’s fitness, then that trait will be more frequent in the population over time.
