Darwin Presents His Case

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Darwin Presents His Case

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Presentation transcript:

Darwin Presents His Case

Learning Objectives Explain how natural selection is related to species’ fitness Explain Darwin’s theory of evolution by natural selection

On The Origin of Species In 1859, Darwin published his book entitled On the Origin of Species.

The Struggle for Existence Members of each species compete regularly to obtain food, living space and other necessities of life.

Fitness Fitness - the ability of an individual to survive and reproduce in its specific environment. Fitness is the result of adaptations

Survival of the Fittest AKA Natural Selection Individuals with characteristics well-suited to the environment will survive and reproduce.

Common Descent All species, living and extinct, were derived from common ancestors. i.e. tree of life

Descent with Modification Each living species has descended, with changes, from an ancestor from the past.

What is Natural Selection? YouTube What is Natural Selection? Amoeba Sisters

Stop Here

Inherited Variation vs. Artificial Selection Inherited variation is passed on through genetics Breed plants and animals for particular traits