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Evolution and the tree of life

Evolution and natural selection

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Introduction to evolution and natural selection
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Ape clarification
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Intelligent design and evolution
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Evolution clarification
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Natural selection and the owl butterfly
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Darwin, evolution, & natural selection
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Variation in a species
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Evidence for evolution
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Evidence for evolution
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Practice
Natural selection and DarwinGet 3 of 4 questions to level up!
Evidence for evolutionGet 3 of 4 questions to level up!

Population genetics

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Allele frequency
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Hardy-Weinberg equation
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Applying the Hardy-Weinberg equation
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Discussions of conditions for Hardy-Weinberg
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Allele frequency & the gene pool
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Mechanisms of evolution
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Genetic drift, bottleneck effect, and founder effect
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Genetic drift
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Natural selection in populations
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Practice
Hardy-WeinbergGet 3 of 4 questions to level up!
Selection and genetic driftGet 3 of 4 questions to level up!

Speciation and evolutionary trees

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Taxonomy and the tree of life
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Species
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Speciation
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Species & speciation
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Biodiversity and natural selection
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Genetic variation, gene flow, and new species
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Discovering the tree of life
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Understanding and building phylogenetic trees
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Phylogenetic trees
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Building a phylogenetic tree
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About this unit

Discover the diversity of life on Earth and the forces that shape it! In this section, you can learn about evolution, natural selection, and the tree of life, as well as basic population genetics. Special bonus: take a peek into the amazing worlds of bacteria and viruses.
Biology is brought to you with support from the Amgen Foundation