DNA in Amber

"Paleo-DNA? From what source? Where do you get 100 million year old dinosaur blood?! " - Ellie Sattler, Jurassic Park

To create dinosaurs you need a blueprint of the animals. From the manny skeletons that have been discovered we can have a reasonal picture of what the animals looked like; but that isn't enough to rebuild the animals. We need know the genetic code of dinosaur DNA in order to grow them. In the Jurassic Park stories there are two sources of genetic information of dinosaurs.

DNA in amber
In the movie Mr. DNA explains how dinosaur DNA can be found:

"A DNA strand like me is a blueprint for building a living thing! And sometimes animals that went extinct millions of years ago, like dinosaurs, left their blueprints behind for us to find! We just had to know where to look! A hundred million years ago, there were mosquitoes, just like today. And, just like today, they fed on the blood of animals. Even dinosaurs! Sometimes, after biting a dinosaur, the mosquito would land on a branch of a tree, and get stuck in the sap! After a long time, the tree sap would get hard and become fossilized, just like a dinosaur bone, preserving the mosquito inside! This fossilized tree sap -- which we call amber waited millions of years, with the mosquito inside until Jurassic Park's scientists came along! "


 * The mosquito had to have had just one species of dinosaur as its food source to avoid a mix-up. Since some species of mosquito have a female lifespan of only a few days and tend to lay eggs following each feeding, this is semi-plausible, though in that case dozens of mosquitoes of different species would have to be found in order to recreate as many kinds of dinosaurs.


 * The scene featuring a close-up of the mosquito clearly shows fuzzy antennae, meaning the particular insect is male. Only female mosquitoes, however, suck blood.