evolution power point
DESCRIPTION
Evolution powe pointTRANSCRIPT
![Page 1: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/1.jpg)
Charles Darwinand the Theory of Evolution
![Page 2: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/2.jpg)
Charles Darwin developed his theory of evolution using four observations and two deductions.
![Page 3: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/3.jpg)
Observation #1:
All organisms produce more offspring than survive to adulthood.
![Page 4: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/4.jpg)
For example: a female rabbit can produce up to seven kittens in a litter, but they don’t all survive to become adults.
![Page 5: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/5.jpg)
Observation #2: Populations remain more or less constant in numbers.
![Page 6: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/6.jpg)
Example:
If an island has a population of 75 mice . . . the number of mice that can be counted on the island at any one time always stays at about 75.
![Page 7: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/7.jpg)
Observation #3: Members of the same species show variation in characteristics.
![Page 8: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/8.jpg)
Iguanas in a population may be of the same species but have different colored skin and markings.
![Page 9: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/9.jpg)
Observation #4: Some characteristics are inherited and are passed on to the next generation.
![Page 10: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/10.jpg)
Example: finches with a beaks of a certain shape pass on that characteristic to their offspring.
![Page 11: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/11.jpg)
Darwin came to 2 deductions as a result of his observations.
![Page 12: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/12.jpg)
Deduction #1: All organisms are involved in a struggle for survival and only the best adapted survive. This is also know as “Survival of the Fittest”.
![Page 13: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/13.jpg)
The individuals that are best adapted to their environment are most likely to survive and have a chance to reproduce. These animals pass off their useful adaptations to the next generation.
Male African Lion
![Page 14: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/14.jpg)
Animals that have the fewest adaptations for survival do not live long enough to breed. They never have offspring. Their weaknesses are not passed on the the next generation.
![Page 15: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/15.jpg)
Deduction #2: Organisms that survive are more likely to reproduce, and therefore pass on their useful adaptations to their offspring.
![Page 16: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/16.jpg)
These ideas formed the basis of Darwin’s theory of evolution. This is also referred to as natural selection.
Male African lion Silverback mountain gorilla
![Page 17: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/17.jpg)
Darwin concluded that natural selection explained how organisms gradually changed and evolved into new species.
![Page 18: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/18.jpg)
At the time of publishing Darwin found it difficult to get his theory accepted, as it was difficult to prove.
![Page 19: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/19.jpg)
Other scientists at the time wanted Darwin to prove that individuals passed their characteristics to their offspring.
![Page 20: Evolution Power Point](https://reader036.vdocument.in/reader036/viewer/2022081515/55892f9ad8b42a57608b45ec/html5/thumbnails/20.jpg)
Since the 1800’s, we now have a greater knowledge of genetics. Much of what we now know about genes and heredity support Darwin’s theory.