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Reverse Evolution

Reverse Evolution . By Richard O’Reilly . What is Reverse Evolution?. What is Reverse Evolution?. Reverse evolution is when an organism loses a trait which it had earlier on. . Is it common to see reverse evolution in nature?.

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Reverse Evolution

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  1. Reverse Evolution By Richard O’Reilly

  2. What is Reverse Evolution?

  3. What is Reverse Evolution? • Reverse evolution is when an organism loses a trait which it had earlier on.

  4. Is it common to see reverse evolution in nature? • All though there are just a few examples of reverse evolution, it is happening. • Some organisms that have undergone reverse evolution are • Humans with Uner-Tan Syndrome • Three spined Stickleback • Cicada like bugs called “treehoppers”

  5. UnerTanSydrome • In Turkey, two families were found to have a syndrome called “Uner Tan” • These humans walked on all fours and were severely developmentally delayed being incapable of speech beyond primitive language. • The cerebellum and the vermis in the brain are missing. • This happens when there is a defect in the chromosome 17P, the biggest difference between chimps and humans.

  6. Uner-Tan Video • http://www.youtube.com/watch?v=mUYEVL_2wFk

  7. Man with Uner-Tan

  8. ThreeSpined Stickleback • The Threespine Stickleback is a fish that inhabits Lake Washington, near Seattle. • More than 50 years ago it lived in extremely polluted water and was protected from its greatest enemy the Cutthroat Trout. • Only 6% of the fish was plated • Today the lake is clean and the fish no longer have the dirty water to shield them from predators. • 49% of the fish are fully plated , 35% are partially plated

  9. Three Spined Stickleback Then and Now!!!!

  10. Whyis this Reverse Evolution • The plates on the fish act as armor, this was a characteristic of fish prior to evolution, these plates are evolution in reverse.

  11. Importance of Reverse Evolution • The Threespine Stickleback has gone through evolution in reverse in order to protect itself from being eaten by predators. • With the plates it is, less palatable • The armor enables it to survive.

  12. “Tree hoppers” • Cicada like bugs called “Treehoppers” have grown back wing-like appendages they once had 200 million years ago!!! • These “wings” located on the first segment of the thorax and abdomen had disappeared and now there back. They are sometimes referred to as a “helmet” • This is the only known example of any insect that has regenerated a third pair of wings.

  13. “Treehopper”

  14. Positive Effects on Reverse Evolution • Organisms such as the Stickleback and the Treehopper have regrown armor in the form of scales and helmeted wings to protect them from predators. • This has enabled them to survive and propagate instead of becoming at risk.

  15. Negative Aspects of Reverse Evolution • Individuals with Uner Tan Syndrome, have reversed evolution as they are not bipedal and their brains are missing vital sections that cause them to be developmentally inferior to today’s humans

  16. Video Evidence of Reverse Evolution • http://www.youtube.com/watch?v=Z2BZRXIo5R4

  17. References • http://www.sciencedaily.com/releases/2008/05/080515120759.htm • http://phys.org/news/2011-05-evolution-reverse-insects-recover-lost.html • http://www.jofamericanscience.org/journals/am-sci/am0610/55_3443am0610_465_469.pdf • http://www.roche.com/media/media_releases/med_dia_2010-07-29.htm • http://3.bp.blogspot.com/_fPtvKkzppMM/TNzDcNrilXI/AAAAAAAAATg/dtUlz6aqe8w/s1600/VIDEO+CLIP+3.jpg

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