From a scientific perspective, this is an interesting question.
It is impossible for Him to have ONLY Mary's DNA, because then He would indeed be a clone of Mary - something that is impossible since He was a man. That being the case, and given what the Bible and the Confessions teach, He must have been made of Mary's DNA plus DNA supernaturally given when He was conceived by the Holy Spirit. Since He was a man, His X chromosome
+ 22 others came from Mary, and His Y chromosome + 22 others (XY = male, XX = female) were given to Him supernaturally. In other words, He had Mary's X chromosome along with her other 22 chromosomes, and He also had a Y chromosome + 22 other chromosomes given by God for a full diploid compliment of 46, which is the normal number for humans.
Since He is referred to as the "second Adam" on the basis of being without original sin, I wonder if God gave Him the same 23 chromosomes (22 + Y) He gave to Adam?
I'm not saying sin is somehow programmed into our DNA or that Jesus was anything less than 100% God, but it is interesting to consider what genetic material God used to form the physical, human aspect of Jesus.
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