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9:04
YouTube
Cambridge A-Level Biology with Dr. Demi
Chapter 17.1: Selection and Evolution - Variation
In this first video of Chapter 17, we will learn how species are formed and the genetic basis for variation. We will also learn how forces of natural selection affect the variation of species in a population. We will recall that variation is caused by independent assortment, crossing over, mutations and a few other factors.
16.8K views
Apr 19, 2021
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