A blood drop contains about a billion of DNA strands.
In « Jurassic park » , we can clone dinosaurs because in the Jurassic era a mosquito bit a dinosaur and sucked a dinosaur’s blood, after that the mosquito went on a tree and the sap blocked him inside, the sap fossilized and became amber. Then scientific extracted the mosquito blood which contained dinosaur blood .
One DNA drop contains three billions of genetic codes, the DNA is very old so some drops missed, a super computer and auto genetic sequencer dissociates DNA drops in few minutes which showed the lacks.
The scientist used frog DNA to fill the lacks and reconstitute the genetic code and you can create a dinosaure.
The DNA is put in a fertilized ostrich egg. In the movie there is no natural reproduction because all dinosaurs are females.