Key Idea We can now model the complete history of a population: 1. Mutation introduces a new trait (Variation). 2. Environmental Pressures make survival difficult. 3. Natural Selection occurs: individuals with the new adaptive trait survive and reproduce. 4. Inheritance passes the trait to the next generation. 5. Time: Over many generations, the population shifts.
Section 1
The Evolutionary Timeline
We can now model the complete history of a population:
Section 2
Individuals vs. Populations
This model confirms a fundamental rule of biology: Individuals do not evolve; populations do.
An individual is stuck with the genes it was born with. Evolution is what happens to the distribution of traits in the group over a long period of time.
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Section 1
The Evolutionary Timeline
We can now model the complete history of a population:
Section 2
Individuals vs. Populations
This model confirms a fundamental rule of biology: Individuals do not evolve; populations do.
An individual is stuck with the genes it was born with. Evolution is what happens to the distribution of traits in the group over a long period of time.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter