15-2 ideas that shaped darwin’s thinking. slide 2 of 25 darwin’s observations

15-2 Ideas That Shaped Darwin’s Thinking

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15-2 Ideas That Shaped Darwin’s Thinking

Slide 2 of 25

Darwin’s Observations

Slide 3 of 25

Darwin’s Observations

15.1 NOTES #1

Describe the pattern Darwin observed among organisms of the Galapagos Islands. MANY PLANTS AND ANIMALS

SEEMED WELL SUITED TO THEIR ENVIRONMENTS.

THE CHARACTERISTICS OF MANY ANIMALS AND PLANTS VARIED AMONG THE DIFFERENT ISLANDS

Page 4: 15-2 Ideas That Shaped Darwin’s Thinking. Slide 2 of 25 Darwin’s Observations

An Ancient, Changing Earth

Homework #1 Hutton and Lyell helped scientists

recognize that Earth is many millions of years old, and the processes that changed Earth in the past are the same processes that operate in the present.1785 – James Hutton 1833 – Charles Lyell

Page 5: 15-2 Ideas That Shaped Darwin’s Thinking. Slide 2 of 25 Darwin’s Observations

Slide 5 of 25

An Ancient, Changing Earth

15.2 NOTES #2

State how Hutton and Lyell described geological change. HUTTON – EARTH WAS SHAPED BY

GEOLOGICAL FORCES THAT TAKE PLACE OVER MILLIONS OF YEARS.

LYELL – GEOLOGICAL PROCESSES OCCURING NOW HAVE SHAPED EARTH’S FEATURES OVER LONG PERIODS OF TIME.

Page 6: 15-2 Ideas That Shaped Darwin’s Thinking. Slide 2 of 25 Darwin’s Observations

Lamarck’s Evolution Hypotheses

Lamarck’s 3 Hypotheses Organisms want to be

complex and perfect Organisms can change

the size and shape of their bodies through use and disuse

Acquired traits (things you get AFTER you are born) are inherited by offspring Homework #2

1809 – Jean-Baptiste Lamarck

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Human Genes and Chromosomes

15.2 NOTES #2

Identify Lamarck’s explanation of how species evolved. SPECIES EVOLVE BY SELECTIVE

USE OR DISUSE OF ORGANS, THIS LEADS TO ACQUIRED OR LOST TRAITS. THESE TRAITS CAN THEN BE PASSED TO OFFSPRING LEADING TO SPECIES CHANGE.

Page 8: 15-2 Ideas That Shaped Darwin’s Thinking. Slide 2 of 25 Darwin’s Observations

Population Growth

Too many babies!!! Malthus published a

book saying babies were being born faster than people died.

If human population continues this way, sooner or later there will be insufficient space and food for everyone.

1798 – Thomas Malthus

Page 9: 15-2 Ideas That Shaped Darwin’s Thinking. Slide 2 of 25 Darwin’s Observations

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Population Growth

Homework #3 War, famine, and disease.

Page 10: 15-2 Ideas That Shaped Darwin’s Thinking. Slide 2 of 25 Darwin’s Observations

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Population Growth

15.2 NOTES #3

Describe Malthus’ theory of population growth. THE HUMAN POPULATION WILL

GROW FASTER THAN THE SPACE AND FOOD SUPPLIES NEEDED TO SUSTAIN IT.

Page 11: 15-2 Ideas That Shaped Darwin’s Thinking. Slide 2 of 25 Darwin’s Observations

Vocabulary

Evolution – change in a species over time

Theory – a well-supported testable explanation of phenomena that have occurred in the natural world

Fossil – preserved remains or evidence of an ancient organism

Page 12: 15-2 Ideas That Shaped Darwin’s Thinking. Slide 2 of 25 Darwin’s Observations

Vocabulary

Ancient – very old

Geology – the scientific study of the origin, history, structure, and composition of Earth

Acquired Traits – traits an organism gets during its lifetime that can not be passed down to it’s offspring

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