Evolution

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Genes Are NOT Changed By Activities In Life

Change Through Mutation Occurs Before An Organism Is Born

Slide 23

Charles Darwin the Naturalist

Slide 24

Voyage of the Beagle

Charles Darwin

Born Feb. 12, 1809

Joined Crew of HMS Beagle, 1831

Naturalist

5 Year Voyage around world

Avid Collector of Flora & Fauna

Astounded By Variety of Life

Slide 25

A reconstruction of the HMS Beagle sailing off Patagonia.

Darwin’s Voyage of Discovery

Slide 26

Darwin Left England in 1831

Darwin returned 5 years later in 1836

Slide 27

HMS Beagle’s Voyage

Slide 28

The Galapagos Islands

Small Group of Islands 1000 km West of South America

Very Different Climates

Animals On Islands Unique

Tortoises

Iguanas

Finches

Slide 29

The Galapagos Islands

Volcanic islands off the coast of South America

Island species varied from mainland species & from island-to-island species

Each island had long or short neck tortoises

Slide 30

Slide 31

The Galapagos Islands

Finches on the islands resembled a mainland finch

More types of finches appeared on the islands where the available food was different (seeds, nuts, berries, insects…)

Finches had different types of beaks adapted to their type of food gathering

Slide 32

Slide 33

Darwin’s Observations & Conclusions

The Struggle for Existence

Slide 34

Voyage of the Beagle

During His Travels, Darwin Made Numerous Observations And Collected Evidence That Led Him To Propose A Revolutionary Hypothesis About The Way Life Changes Over Time

Slide 35

Darwin’s Observations

Patterns of Diversity were shown

Unique Adaptations in organisms

Species Not Evenly Distributed

Australia, Kangaroos, but No Rabbits