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Evolution and the reasons for extinction. Kathleen Gabriel. Darwin and Evolution. What is evolution?. “Change in the gene pool of a population from generation to generation by such processes as mutation, natural selection, and genetic drift .” - PowerPoint PPT Presentation
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WHAT IS EVOLUTION? “Change in the gene pool of a population
from generation to generation by such processes as mutation, natural selection, and genetic drift.”
What this means is that as living things reproduce in the ever changing environment, genes mutate to adapt to accommodate for the new tasks the body must perform to survive.
CHARLES DARWIN
A naturalist who developed the evolution theory
On a voyage around the waters of South America, Darwin made his first discovery. He found several fossils of extinct animals and
started to ponder how they were similar to the live ones
But it was not until they reached the Galapagos Islands that Darwin made his biggest discovers that gave way to what we know today about evolution.
DARWIN’S DISCOVERY Darwin collected many different kinds of
birds, or so he thought. He discovered that all the birds were the
same; they were all finches. Darwin began pondering why the
finches would change. He discovered that the beaks differed
depending on what the different birds ate on their separate islands.
THE THEORY OF EVOLUTION!!! noun (biology) a scientific theory of the
origin of species of plants and animals
WHAT WE KNOW NOW Darwin didn’t have the technology we
do today allowing us to actually see the DNA.
In the DNA only one chromosome letter different and the bird would be black instead of splotchy.
How does nature keep up with the incredible amounts of types and species?
WHAT IS EXTINCTION “Biology. the act or process of becoming
extinct; a coming to an end or dying out: the extinction of a species.”
(morbid picture sorry)
WHY DOES EXTINCTION HAPPEN? Scientists aren’t entirely sure why
extinction happens Two of the many speculations are:
Human huntingChanging environment
Neither of these quite explain the sudden disappearance of our friends the dinosaurs though
ARE HUMANS NEXT? As we steadily deteriorate our climate
and heat the earth, there may not be much option for the humans.
We need to help the earth by reducing carbon dioxide emission and going green.