A Level Biology Revision “Stabilising Selection and Directional Selection”
Author: Freesciencelessons via YouTube
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In this video, we look at stabilising selection and directional selection. First we explore stabilising selection, using the example of birth weight in humans. We then look at directional selection, including the presence of antibiotic resistance.
Image credits:
Basketball
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Christopher Johnson, CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons
Bird
https://commons.wikimedia.org/wiki/File:Fringilla_coelebs_chaffinch_male_edit2.jpg
MichaelMaggs – Edited (sharpened, down-sampled, contrast corrected, noise removed) by: Arad, CC BY-SA 2.5 https://creativecommons.org/licenses/by-sa/2.5, via Wikimedia Commons
Staph A
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Content Providers(s): CDC/ Matthew J. Arduino, DRPH Photo Credit: Janice Haney Carr, Public domain, via Wikimedia Commons