Researchers at the University of Kent say their groundbreaking studies unlock one of the greatest mysteries about the prehistoric monsters – why they came in such varied sizes and shapes.
It is also said the team’s work will explain how dinosaurs were able to be the most dominant species on Earth for nearly 200 million years.
Professor Darren Griffin, who led the research, said they were able to map out the creatures’ genetic code by studying the DNA of their closest living relatives, turtles and birds.
It is believed that dinosaurs were so varied in their appearances because they had vastly more chromosomes than humans possess.
Professor Griffin explained: “We think it generates variation. Having a lot of chromosomes enables dinosaurs to shuffle their genes around much more than other types of animals.
“This shuffling means that dinosaurs can evolve more quickly and so help them survive so long as the planet changed.”
Dr Rebecca added: “The fossil evidence and now our evidence reinforces the idea that rather than birds and dinosaurs being distant relatives, they are one in the same.
“The birds around us today are dinosaurs.”
Professor Griffin told the BBC: “We are not going to have Jurassic Park anytime soon.
“If you take the DNA of a chicken and put it into an ostrich egg you won’t end up with a chicken or an ostrich. You will end up with nothing. The same would be true of a velociraptor or a T-Rex It just wouldn’t work.”