MAKE-UP

SPECIES VARY LOCALLY

Darwin noticed that difference, yet related, animal species often occupied different habitats within a local area.

Good example for this is the Hood island vs. Isabella island tortoise (galapagos islands)

SPECIES VARY OVER TIME

Darwin noticed that some fossils of extinct animals were similar to living species.

APPLYING THE BIG IDEA

You have learned that both Biotic and Abiotic factors affect ecosystems. Give some examples of each, and explain how Biotic and Abiotic factors could have affected the tortoises that Darwin observed on the Galapagos Islands.

16.2 IDEAS THAT SHAPED DARWIN’S THINKING

Key Questions1. what did Hutton and Lyell conclude about Earth’s History2. How did Lamark propose that species evolve3. What was Malthus’s view of population growth?4. How is inherited variation used in artificial selection

Vocab:

1. Artificial selection

AN ANCIENT CHANGING EARTH

James Hutton (1726-1797) Scottish farmer/naturalist History of the Earth can be determined by understanding

present erosion and sedimentation Founder of Modern Geology Thought the earth was much older than the accepted

6,000yrs “Theory of Uniformitarianism”: This was the belief that

geological forces at work in the present day—barely noticeable to the human eye, yet immense in their impact—are the same as those that operated in the past.

Charles Lyell (1797-1875) The laws of nature are constant Erosion/mountains/volcanoes…etc Theory of Uniformitarianism

Summary: This all takes time!!! In order for all this to have happened…the earth is pretty darn old!!!!

TIME……

“EVOLUTION”

Jean-Baptiste Lamarck (1744-1829) All organisms have an inborn urge to become more

complex Change comes from using them in new ways Changes during its life would be passed to its offsrping “acquired characteristics”

Problems with Lamarck’s Theory: No internal drive to better itself Acquired traits are not passed to offspring

***Significance: He was the 1st to try to explain evolution using the natural process

POPULATION

Robert Malthus 1766-1834“If human population grew unchecked, there wouldn’t be enough living space and food for everyone”

Significance to Darwin?1. This could apply more to other

organisms2. Why hasn’t life run out of space?

a. Why do so many die?b. Why do so many live?

What does this support?

ARTIFICIAL AND NATURAL SELECTION

Artificial selection: nature provides the variations, and humans select those they find useful.

How have we practiced “selection”

How could we?

REVIEW

What were Hutton's and Lyell’s ideas about the age of the Earth and the processes that shaped the planet?

How would Hutton and Lyell explain the formation of the grand canyon?

What is an acquired Characteristic? What role did Lamarck think acquired Characteristics played in evolution?

What parts of Lamarck’s hypothesis have been proven wrong? What did he get right?

According to Malthus, what factors limit human population growth?

How did Malthus influence Darwin

16.3 DARWIN'S CASE

Key Questions:1. Under what conditions does natural condition occur?2. What does Darwin’s mechanism for evolution suggest about living and extinct species.

Vocab:1. Adaptation2. Fitness3. Natural Selection

16.3

Adaptation: Any heritable characteristic that increases an

organisms ability to survive and reproduce in its environment

Fitness How well an organism can survive and reproduce

in its environment

Natural selection Process by which organisms with variations most

suited to their local environment survive and leave more offspring.

16.4 EVIDENCE OF EVOLUTION

Key questions How does the distribution of species support

evolution? How do fossils support evolution? How do Homologous structures and embryology

support evolution? What evidence of evolution comes from molecular

biology? What does the Galapagos finches show about natural

selection Vocab:

Biogeography Homologous structure Analogous structure Vestigial structure