Biology / Unit 1 Bio 0055 short lesson, about 20 seconds
Evolution
Captions available
The idea
In this course, evolution names a change in a population's allele frequencies across generations — the process, not one mechanism driving it.
In practice
A population's mix of gene variants can shift generation to generation long before anyone observes a new trait appearing.
Where people slip
This course keeps evolution and natural selection distinct; the second is one mechanism of the first, not a synonym.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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