Book overview
Darwin surveys the wide range of variation produced in domesticated animals and plants, and how breeders select for desirable traits. He argues that human selection shows how significant changes can accumulate from small hereditary variations over generations.
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Best takeaways to keep
Domestic breeds show marked variability in form, color, and behavior compared with wild ancestors.
Artificial selection demonstrates that selection of small, heritable differences can produce major changes.
Correlation of growth and inheritance patterns mean selecting one trait often alters others.
Use and disuse, changed conditions, and crossing influence variability and improvement.
Use examples of selective breeding to illustrate how incremental inherited changes can accumulate into major differences over time.
Darwin surveys the wide range of variation produced in domesticated animals and plants, and how breeders select for desirable traits. He argues that human selection shows how significant changes can accumulate from small hereditary variations over generations.
Retrieval practice
Which observation from domesticated animals and plants did Darwin use to support his theory of natural selection?
What core idea does Darwin borrow from Malthus and apply to natural populations?
Which best summarizes Darwin’s mechanism of natural selection?
How did Darwin explain the apparent lack of many intermediate fossil forms in the geological record?
Quiz preview
Which observation from domesticated animals and plants did Darwin use to support his theory of natural selection?
- Selective breeding shows that small heritable differences can accumulate into large changes over generations
- Domesticated species never vary from their wild ancestors
- Domestication proves species are fixed and unchangeable
What core idea does Darwin borrow from Malthus and apply to natural populations?
- Populations produce more offspring than can survive, creating a struggle for existence
- Organisms consciously change their traits to survive
- Resources always increase to match population growth
Which best summarizes Darwin’s mechanism of natural selection?
- Heritable variation leads to differential reproductive success so advantageous traits become more common over generations
- Natural selection creates new useful traits de novo in individuals when needed
- Evolution proceeds only by sudden large jumps, not gradual change
How did Darwin explain the apparent lack of many intermediate fossil forms in the geological record?
- The geological record is imperfect—sedimentation is discontinuous and many intermediate forms are not preserved or have been destroyed
- He admitted that intermediate forms never existed and his theory was invalid
- All intermediate forms are abundant but have been ignored by paleontologists
Chapter map
Variation Under Domestication
Darwin surveys the wide range of variation produced in domesticated animals and plants, and how breeders select for desirable traits. He argues that human selection shows how significant changes can accumulate from small hereditary variations over generations.
Variation Under Nature
Darwin examines variation among wild organisms, noting continuous variation, local races, and the difficulty of drawing sharp species boundaries. He emphasizes that natural varieties mirror domesticated variation and can be acted upon by natural selection.
The Struggle for Existence
Drawing on Malthus, Darwin argues that more organisms are born than can survive, creating a constant struggle for resources. This competition means that favorable variations will tend to be preserved while unfavorable ones are eliminated.
Natural Selection; or the Survival of the Fittest
Darwin outlines natural selection as the process by which advantageous heritable traits become more common because individuals with them leave more offspring. He explains cumulative selection, divergence of character, and how new species arise by the slow accumulation of beneficial variations.
Laws of Variation
Darwin explores possible causes of variation, such as inheritance, correlations of growth, reversion, and the effects of changed conditions, but acknowledges many causes remain unknown. He distinguishes direct effects of environment from inherited variability and notes patterns that influence how traits arise and persist.
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