As for information on DNA I am a Clinical Trial Assistant by trade, trained in Biochemistry...
As for information that demonstrates spirit beings can become manifest in the flesh, I got that from all through the Bible...Gabriel for example appears to Daniel twice as a man...YHVH (I believe the Son, because Jesus tells us no man has ever seen the Father or ever heard His voice) also appears as a man to Joshua, Jacob, Manoah and his wife, etc.)...an angel appears as a man in Judges 19...two who are sent by YHVH in the tent of Abraham (also in the form of a man) to reign fire and brimstone down upon them from YHVH in heaven...all the malevolent spirits in the New Testament possess (control or indwell) people and even some pigs, and so on...
HOW a spirit can assume or manifest in a physical form or take one over, I cannot speak as to the details...
Some (like most Calvinists) believe it is only if God wills them to
Others (like RCCs, EOs, and Arminians) would say certain orders of angels have free will (like what we call Arch-Angels...like Gabriel, and the one we call Satan...who also have free will, thus the ability to rebel), Therefore some may be able to manifest into a flesh form of their own will (similar to our glorified bodies after the resurrection), others like the Seraphim are created with unalterable purpose and cannot step outside their realm.
However do not confuse ability with desire...I may desire to kill someone and drink their blood and I am certainly capable but the very thought (even mentioning it here) repels me and I would never ever do such a thing...I find it vile and ultimately depraved...someone else may live for it. Such is the nature of free will beings...one yields to the higher pullings of the Spirit and another to the beastial pullings of the flesh (with a whole spectrum of degrees of possibility in between)
In His love
brother Paul
Good information to know Paul. I also am aware of those Bible occurrences but they do not tell how it can happen only that it did.
That was my main point and you just answered it.........
"HOW a spirit can assume or manifest in a physical form or take one over, I cannot speak as to the details..."
That I agree with 100%!!!
About the rest of your comment.....not so much.