aristotle living things are “immutable” observed anatomical features that seemed to serve no...
TRANSCRIPT
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EvolutionLesson 2 – Evolution of an Idea
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Aristotle
Living things are “Immutable”
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Buffon (1707-1788) Observed anatomical
features that seemed to serve no purpose and wondered why they existed.
Theorized that this was evidence that species have changed over time.
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Carl Linnaeus (1707-1778) – Developed classification system that highlighted similarities between organisms.
Erasmus Darwin (1731-1802) – Believed organisms change over time and the earth was millions of years old. All life originated
from a single source. Did not propose a mechanism for this.
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Chevalier de Lamarck (1744-1829)
One of the first scientists to propose a mechanism for evolution.
Lamrack’s First Principle: Use and disuse
He believed that structures an individual used became larger and stronger, while structures that were not used became smaller and weaker.
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Lamrack’s Second Principle: The Inheritance of Acquired Characteristics
He believed that individuals could pass on to their offspring characteristics they had acquired during their lives.
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Lamarck’s Contributions
All species evolve over time A species evolves in response to its
environment and becomes better adapted to that environment
Changes are passed on from generation to generation
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Georges Cuvier (1769-1832): a famous paleontologist who conducted the first
detailed studies of fossils. He noted the following: Fossils of very simple organisms are found in all
depths of fossil deposits Fossils of more complex organisms are found
only at shallower depths, in younger rock Fossils in the shallower depths are more likely to
resemble living species Rock layers contain fossils of many species that do not occur in layers above or below them.
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Theory of Catatrophism (Cuvier) the theory of catastrophism which states that the patterns of fossils could be
accounted for by a series of global catastrophes (such as floods) that wiped out most species on Earth. These wiped out species were then replaced with a newly created set of species.
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Charles Lyell (1797-1875):
- The father of geology. He studied rocks and fossils and came up with the opposite conclusion to Cuvier.
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Charles Lyell
He proposed the theory of uniformitarianism. Earth has been changed by the same processes
in the past that are occurring in the present Geological change is slow and gradual rather
than fast and catastrophic Natural laws that influence these changes are
constant and eternal, and they operated in the past with the same intensity as they do today.
Lyell’s theories directly challenged the belief in a very young Earth. If he was right, Earth was extremely old and life had had a very long time to undergo evolutionary change.
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Charles Darwin (1809-1882):
22 years old, he set sail along the HMS Beagle for a five year voyage.
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Darwin
During his travels, he visited the Galapagos Islands where he made a valuable observation. He noted that the flora and fauna on the Galapagos Islands resembled to the ones on continental South America even though they had complete different habitats.
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Darwin
He also noted that there were no amphibians or large mammals on the island, indicating that only species that could arrive by air or water lived in the Galapagos.
It seemed that the islands had been populated by species that arrived from elsewhere; however, most of these species only resembled species in the mainland. This was the beginning of the theory of evolution.
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Darwin’s Finches
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Why’s Darwin a Big Deal?
Although Darwin was not the first to propose the theory of evolution he (along with Alfred Wallace) proposed natural selection as the mechanism of evolution. His years of study, observations and
writing gave enoughevidence for the theory to be seriously considered.
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http://www.youtube.com/watch?v=vfmOaAz371M
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Current Interest in Lamarckism Epigenetics is the study of heritable changes in
gene activity which are not caused by changes in the DNA sequence.
Changes can occur response to environmental
influences
http://www.youtube.com/watch?v=kp1bZEUgqVI
ARTICLE: http://discovermagazine.com/2013/may/13-grandmas-experiences-leave-epigenetic-mark-on-your-genes
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Examples - Diet in Humans Pregnant Woman who experience
starvation have abnormally small babies.
Their children (even if dietary needs are meet) have small Babies.
May be some epigenetic factors in obesity.