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🧬 How Evolution Works

In 1977 a Galápagos drought moved a finch beak in one generation. Here is the machinery — variation, selection, genes, and the tree — without the slogans.

5
lessons
~20 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. Variation is the raw materialExplain why heritable variation is required for evolution.Populations differ genetically through mutation, sex, and gene flow. Evolution is generational change in populations, not lifetime stretching of individuals.
  2. Selection is not randomDefine natural selection and fitness without everyday myths.Environments filter heritable traits by reproductive success. Mutation is random in origin; selection is not.
  3. Inheritance and genesConnect alleles, frequencies, drift, and inheritance to evolutionary change.Genes make evolution measurable as allele-frequency change. Drift, selection, migration, and mutation all move the scoreboard.
  4. Speciation and the tree of lifeDescribe speciation, homology, and phylogenies as historical science.Lineages split when gene flow fails. Nested homologies and phylogenies reconstruct the branching tree — with extinction as constant pruning.
  5. Evidence written in rock and DNAIntegrate fossils, genomes, and real-time studies as evidence.Fossils, shared molecular scars, and modern experiments converge on descent with modification. Mechanism plus archives beat slogan debates.

Questions this course answers

What is the main evolutionary role of mutation?

Mutation creates new DNA variants; selection and other processes then change how common those variants become.

Why do biologists say populations evolve but individuals do not, in the technical sense?

Evolutionary change is tracked in populations over generations; individuals develop but do not rewrite the population gene pool by stretching or learning alone.

Match each idea to its meaning in evolutionary biology

Mutation supplies variation; selection filters by reproductive success; fitness measures that success, not gym strength.

Put the steps of natural selection in order

Selection requires heritable variation plus differential reproductive success that shifts the population.

What is genetic drift?

Drift is chance change in allele frequencies. It happens in every finite population and is especially powerful when numbers are small.

Fill in the key term

Population genetics frames evolution as change in allele frequencies across generations.

Grounded in trusted sources

  • Understanding Evolution, University of California Museum of Paleontology — Evolution 101 (mechanisms, homology, misconceptions): https://evolution.berkeley.edu/evolution-101/
  • OpenStax Biology 2e — Ch. 15 The Genetic Code; Ch. 18 Understanding Evolution; Ch. 19 Population Evolution: https://openstax.org/books/biology-2e/
  • National Academy of Sciences, Science, Evolution, and Creationism (2008): https://nap.nationalacademies.org/catalog/11876/science-evolution-and-creationism
  • NHGRI, Scientists Analyze Chromosomes 2 and 4 (6 April 2005): https://www.genome.gov/13514624/2005-release-scientists-analyze-chromosomes-2-and-4
  • Boag & Grant, Intense natural selection in a population of Darwin's finches (Geospiza fortis), Science 214 (1981); Grant & Grant, Fission and fusion of Darwin's finches populations, Phil. Trans. R. Soc. B 363 (2008)

Every Wunder lesson is built from real, reputable sources — never invented.

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