The Insect That Started It All...

And it all begins with the existence of this insect, a family group of prehistoric mosquito that didn't exist in our timeline, but that I've speculated as kind of the butterfly effect to make everything in the Jurassic franchise possible.

In this timeline, it is part of a very ancient, diverse, but sadly extinct group of blood-sucking insects called 
CULICIANIX MAXIMUM. 

Both fossil-records and amber-records show that in this version of our world, these insects thrived with the rise of dinosaurs, feeding of their highly oxygenated blood, growing to a size of 2 cm lengthwise and possessing a 3 cm wingspan.

In many ways, this mosquito is not much different from those of our timeline, except that, feeding exclusively on the high-oxygen blood of dinosaurs and pterosaurs, these insects have a slightly different stomach compound (involving acids similar to vinegar) and as such, a much slower digestion process. 

This means that this mosquito drinks more blood, but has to rest for much longer and because of that, it made it vunerale to getting engulfed in tree sap spilling out of holes in the bark, caused by a dinosaur rubbing it's horns, thumb-spikes or armour against the tree.

As the insect drowns in the sap, both it and the goop around begin to harden, encasing the dinosaur blood in a protective shell, while the stomach chemicals accidentally work as a natural preservative. So why it is not perfect, over 87% of the DNA is protected from the elements of decay.

Then, millions of years later, people begin to dig up this fossilised amber, and selling a it for it's "beautiful red centre" and eventually, InGen scientists came along, carefully extracted the persevered blood, multiplied it and well "BINGO, DINO DNA!"

and the rest is history.....