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Could evolution ever bring the dinosaurs back?



Have you seen the 1993 blockbuster movie "Jurassic Park" and wondered, "Could that really happen, could the dinosaurs ever come back?" The idea that these mighty creatures might one day return to Earth is equally fascinating and frightening to most people.

Even real-life researchers are intrigued as to whether the evolutionary process could bring us into the age of the world tyrannosaurs. But Susie Maidment, a vertebrate paleontologist at the London Natural History Museum, quickly rejected the idea that a DNA-filled mosquito kept in amber for millions of years ̵

1; as in "Jurassic Park" – could ever help restore an extinction dinosaur.

"We have mosquitoes and biting dinosaur-era flies, and they conserve amber," Maidment said in a statement. "But if amber preserves things, it tends to conserve the shell, not the soft tissues, so you do not get blood in mosquitoes in amber." [Is It Possible to Clone a Dinosaur?]

Researchers have found blood vessels and collagen in dinosaur fossils, but these components do not contain true dinosaur DNA. Unlike collagen or other robust proteins, DNA is very sensitive and sensitive to sunlight and water. The oldest DNA in the fossil record is about 1 million years old and the dinosaurs died about 66 million years ago.

Maidment added, "Although we seem to have blood from mosquitoes that are up to 50 million years old, we have found no DNA, and to reconstruct something, we need DNA."

Jamal Nasir, a geneticist at the University of Northampton in the UK said he could not rule out the idea of ​​dinosaur evolution, the dead, saying that development is not fixed or planned, in other words, anything could happen. "Evolution is largely stochastic [randomly determined] and evolution does not necessarily have to go in a forward direction; she could have multiple directions. I would argue that the return to dinosaurs is more the reverse since the building blocks are already there. Of course, according to Nasir, there should be the right conditions for dinosaurs to reappear. "Of course, one could imagine viral pandemics that could disrupt our genome, our physiology, and our behavior beyond our control," he told Live Science, in turn, could create the right conditions for evolution to re-invent the ancient reptiles.

While evolution may not be trend-setting in any particular direction, we know that we do not see it revert to the same animal Maidment. "We can see an animal that is closely related and occupies a similar ecological niche. For example, ichthyosaurs were sea reptiles with long, pointed snouts and dolphin-like body shapes and tails, "she told Live Science." Today we see the dolphin and it is likely to occupy a similar ecological niche. But we would not call a dolphin an ichthyosaur because it does not have the anatomical properties that make it ichthyosaurs. "[What If a Giant Asteroid Had Not Wiped Out the Dinosaurs?]

Also, dinosaurs are never quite extinct, said Maidment, and birds evolved from carnivorous dinosaurs In strict biological definition, all that has emerged from this common ancestor is a dinosaur that has the same anatomical features.

"Dinosaurs are still with us," said Maidment say that dinosaurs are extinct, but only the non-avian dinosaurs died out. Birds are dinosaurs, and birds are still evolving, so we're sure to see new species of birds – and they'll be new dinosaur species. "] Some scientists even try to study the evolutionary process by trying to turn a chicken into a dinosaur However, if this beast ever comes to fruition, it will not be a replica of a dinosaur, but a modified chicken, said Jack Horner, a research associate at the Burke Museum at the University of Washington, previously told Live Science. [19659002] For more than 66 million years, things have changed drastically, and if one day a dinosaur had regressed to earth, it would be a completely different world.

"An animal naturally extinct, perhaps 150 million years ago, does not something in this world recognize when you bring it back "said Maidment. What will it eat, if at that time [yet] no grass developed? What is its function, where do we fix it, does anyone own it? "

That is, it may be best to leave sleeping dinosaurs," she said.

Originally published on Live Science .


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