1 / 5

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.

kim-sherman
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related