3.6 Biology - Environment and Evolution
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7 Terms
What is a selection pressure?
An environmental factor that affects an organism's chance of surviving and reproducing.
Give an example of a selection pressure affecting humans.
Climate change, food availability or predators.
How can climate affect human evolution?
Changes in climate can create new selection pressures that favour different characteristics.
What is natural selection?
Individuals with advantageous inherited characteristics are more likely to survive and reproduce, causing those characteristics to become more common.
Does an individual evolve?
No. Populations evolve over generations.
What is variation?
Differences in characteristics between individuals of the same species.
Why is variation important for natural selection?
It provides differences that natural selection can act on.