Aim: What are the main ideas of Darwin’s theory of natural selection

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Presentation transcript:

Aim: What are the main ideas of Darwin’s theory of natural selection

Charles Darwin 1809-1882

Overproduction Within a population, more offspring are born than can possibly survive.

Competition Offspring compete for space, food, water, and other limited resources.

Variations Differences in traits make certain individuals better adapted to survive.

Survival of the Fittest Organisms with favorable traits survive; organisms with unfavorable traits may die off.

Reproduction Individuals that survive pass on the favorable traits to their offspring.

Evolution of Species (Speciation) Over time, there are so many variations that the population becomes a new species.

Example: A Giraffe had many offspring Offspring competed for limited resources Offspring had different length necks (variations) Giraffes with longer necks could reach trees and survive; short necked giraffes starved and died (survival of the fittest) Long-necked traits were passed on to the offspring. giraffes fighting