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Evolution

Published on Nov 18, 2015

evolution

PRESENTATION OUTLINE

Evolution

By Jack Long

Who is Charles Darwin?

Journey began in 1831, when he was invited to sail on the HMS Beagle's five year voyage along the route. He planned to collect specimens of plants and animals, naturalist and scientist from England. His theory explains how modern organisms evolved over millions of years.

Darwin's Contributions

Developed a theory of evolution that explains how modern organisms evolved over long periods of time from common ancestors.

What is he given credit for?

Coming up with the Theory of Evolution

Details of Voyage

Began in 1831, Darwin planned to collect specimens of plants and animals, No one knew this would be one of the most important scientific voyages in history, because the Beagle trip led Darwin to develop what has been called the single best idea anyone has ever had.

Observations from Voyage

1.) Species vary globally
2.) Species vary locally
3.) Species vary over time

Process of NAtural selection

Adaption- Any heritable trait that helps an organism survive in its environment
Fitness- describes how well an organism can survive and reproduce in its environment
Survival of the Fittest- Individuals that have adaptions that make survival and reproduction easier

Evidence that supports evolution

1,)Darwin planned to collect plant and animal specimens along the way.
2.) At the time, no one knew how important the trip would be
3.) It explains how modern organisms evolved over long periods of time from common ancestors
4.) Offers insights that are vidal to all bunches of biology

ENVIRONMENTAL effects on species over time

Variations help a species survive when the environment changes. In dry years, there were not enough small seeds for all of the finches. Finches with larger beaks were able to break open larger seeds.

Explanations of the different types of selection

Directional- Occurs when selection favors 1 extreme trait value over the other extreme
Disruptive- Occurs when the extreme trait values over the intermediate trait values
Stabilizing- Occurs when selection favors the intermediate trait value over the extreme values

Scientists who also contributed

Hutton- Described how geological processes shape the land
Lyell- Argued that the laws of nature do not change over time
Lamarck- Proposed that all organisms are born with a desire to become better
Malthus- Thought that overcrowding led to conditions that would slow down population growth

Citation

Miller, Kenneth R., and Joseph S. Levine. "Unit 5." Miller & Levine Biology. Boston, MA: Pearson, 2010. N. pag. Print.

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