Welcome to my Metazoic site! This site discusses the existence of the creatures to come along after humans will be extinct. I first became interested in a world after man when I acquired my first copy of Dougal Dixon's After Man: A Zoology of the Future in 1992. However, I unwittingly created creatures that did not exist from the time I was about 8 years old. But it was after I obtained a copy of that book (now a collector's item) that I decided to take these same creatures I created as a child and make them more realistic in an evolutionary sense. Though it may be hard for a lot of us to grasp, humans will soon become extinct. One of the biggest factors of how this will happen is the current overpopulation rate. Which is why I don't contribute to the population. I created this world with little more than mammals fulfilling all ecological niches with the help of some friends. I even gave the era of the age after man a name, I called it the Metazoic, derived from the words for "After-era" (Meta, meaning after, and zoic meaning era). We are now in the Cenozoic era. To view all the animals I have created since I began this project, you can go to the "Meet the Mammals" section of this site. To discuss your own ideas about what you think will happen in the future world, and share your ideas with others, please feel free to leave a comment.
One more thing, some of you may find this site quite offensive, and you have a right to your own opinion. But please respect my right to have an opinion too. I'm not saying there is no GOD, I believe it was HIM who got the ball rolling. But I believe after that, evolution took over. There is so much more evidence of evolution than there is of creation. Even that going on right under our noses. Other than that, enjoy yourself and visit our many links.
Monday, January 12, 2009
Fruit Flies Put Evolution in Reverse
Fruit Flies Put Evolution in Reverse
Jan. 12, 2009 -- If you could put an animal in a time machine and send it back to live in the distant past, would its DNA evolve in reverse, returning to the genetic code of its ancestors?
The intriguing idea has been tested by scientists in Portugal and the United States, using the fruit fly (Drosophila melanogaster) as the animal, and a laboratory to recreate the conditions of the past.
Modern-day fruit flies are the distant descendants of an original group that had been harvested in the wild back in 1975.
Over the following decades, 500 generations of flies grew up in different environments.
Different groups of insects were starved, exposed to greater humidity and so on in various experiments, and as a result developed specific characteristics, molded by these conditions.
Henrique Teotonio and colleagues put these various populations back into the ancestral environment and let them reproduce for another 50 generations.
They then took a close look at a telltale stretch of DNA, on Chromosome 3, to see whether "reverse evolution" had taken place.
The answer: Yes, it had, but only up to a point.
Once the flies had adapted comfortably to their new environment, the backwards-winding clock of evolution came to a halt, according to their paper, published on Sunday in the journal Nature Genetics.
"Reverse evolution seems to stop when the populations of flies achieve adaptation to the ancestral environment, which may not coincide with the ancestral [genetic] state," said Teotonio.
"On average, only half of the gene frequencies revert to the ancestral gene frequencies. Evolution is contingent upon history at the genetic level, too."
The work also suggests evolution is rather more complex and less linear than is generally thought, Teotonio said.
For one thing, it shows that species can evolve from generation to generation by reshuffling variant forms of a gene, rather than introducing new mutations of it, he said.