You are speaking of parthenogenesis, which occurs naturally, though very rarely. In such cases, only a daughter can be born.
If you accept that Almighty God can conceive by a virgin, then you must accept that He can give her the DNA necessary to have a Son. That DNA is not available to us to study, nor should it be, in my opinion.
Neither is the DNA of Mary, by the way. You can spend a billion years digging thousands of feet below the surface in every square inch of the Holy Land, and your odds of finding Mary's body in a tomb are no better than your odds of finding her Son's body in a tomb.
Hence, the doctrine of the Assumption.
I rest my case.