A Swiss Physician by the name of Friedrich Miescher was the first to discover that DNA is a distinct molecule and called it nuclein however he was not the first to discover DNA he just called it nuclien, the first person to discover DNA was Francis Crick.
The final solution was carried out through, well, the holocaust. You have the answer, but I would say the final solution was carried out through the mass killings of approximately 6 million Jews (and other minorities) in order to reserve the so called “pure blooded Aryan race”