Natural Selection – Crash Course Biology #14


Hank guides us through the process of natural selection, the key mechanism of evolution.

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Table of Contents:
1) Natural Selection 1:27
2) Adaptation 2:56
3) Fitness 3:36
4) Four Principals 3:54
a. Variations 4:01
b. Heritability 4:17
c. “The Struggle for Existence” 4:25
d. Survival and Reproductive Rates 5:00
5) Biolography 5:59
6) Modes of Selection 7:40
a. Directional Selection 8:17
b. Stabilizing Selection 8:56
c. Disruptive Selection 9:27
7) Sexual Selection 10:22
8) Artificial Selection 11:24

References for this episode can be found in the Google document here:

This video uses the following sounds from
“20071104.forest.04.binaural.mp3” by dobroide
“ForestBirds.wav” by HerbertBoland

crashcourse, science, biology, natural selection, genetics, peppered moth, inherited traits, population genetics, charles darwin, darwin, on the origin of species, evolution, adaptation, galapagos finches, fitness, variation, phenotype, heritable, malthus, survival rate, reproductive rate, crossbreeding, inbreeding, genotype, directional selection, stabilizing selection, disruptive selection, selective pressures, sexual selection, artificial selection, selective breeding Support CrashCourse on Patreon:


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  1. This video confirms that I am a runt, who should not exist, and would not if it were not for modern medicine.

  2. Y'all talking about cramming for bio exams and stuff how old are you😂 I'm in 6th grade and biology is killing me

  3. POV : you’re scrolling through the comments while watching this video because your biology teacher assigned you it for online school

  4. 4:53 My hope is none of us survive and are wiped off the face of the Earth. We’ll let some other species have a chance to screw up the world.

  5. That hypothesis about giraffes having long necks is actually not true! The longer their neck, the higher their chance of winning a fight. Then they get the lady giraffe of their choice.

  6. Is Hank single? Nothing is hotter than a cute nerd excited over science! 😀 And CORGO! Used to have 2… I miss them.

  7. Science is not the chasing and maintain by right side, is the suspect and inspect to prediction of theory human made, so science becomes to left side more and that’s why so many people hate science and become the virus and enemies to science, and also that happens to Darwin Natural selection.


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