Loxuru
Graf von Kreuzigung
Rosalind Franklin, actually.But the essence of the DNA is its information not its physical structure which indeed is only known since the 1950ies due to Wilkins (I think)
Medieval "science" had adopted theories of Aristotle and Hippocrates, about 'acquired characteristics' ransmitted from parents to children. Some thought, the information was kept as substances in the blood, that were given to the foetus.That there is some kind of "information" transported via mother and father to the child (except in medival times) is know to all peoples in all times,
If I were a Catholic scholar, I would try to find out this intriguing question. Perhaps, God is the creator of everything, including DNA and chromosomes.the Holy Ghost likely doesn't have genes, in the physical sense, so where the X chromosome came from is anybody's guess.
It is a similar problem as the question where Kain and Abel's wives came from?