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KEY CONCEPT Darwin proposed natural selection as a mechanism for evolution.

KEY CONCEPT Darwin proposed natural selection as a mechanism for evolution. neck feathers. crop. tail feathers. Several key insights led to Darwin’s idea for natural selection. Darwin noticed a lot of variation in domesticated plants and animals.

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KEY CONCEPT Darwin proposed natural selection as a mechanism for evolution.

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  1. KEY CONCEPT Darwin proposed natural selection as a mechanism for evolution.

  2. neck feathers crop tail feathers Several key insights led to Darwin’s idea for natural selection. • Darwin noticed a lot of variation in domesticated plants and animals. • Artificial selection is the process by which humans select traits through breeding.

  3. Natural selection is a mechanism by which individuals that have inherited beneficial adaptations produce more offspring on average than do other individuals. • Heritability is the ability of a trait to be passed down. • There is a struggle for survival due to overpopulation and limited resources. • Darwin proposed that adaptations arose over many generations.

  4. VARIATION OVERPRODUCTION ADAPTATION DESCENT withMODIFICATION Natural selection explains how evolution can occur. • There are four main principles to the theory of natural selection. • variation • Fitness is the measure of survival ability and ability to produce more offspring. • overproduction • adaptation • descent with modification

  5. five digits wrist bone Natural selection acts on existing variation. • Natural selection can act only on traits that already exist. • Structures take on new functions in addition to their original function.

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