Interesting concept there. Seeing as his father is not human, I can see the problem. Here is what I see to be the easy solution though. Jesus was fully man an fully God. In order to be fully man, he has to be fully human. In order to be fully human, he has to have the right number of chromosomes that make a human a human. How did he get the other half then? Well, I think that it is likely and easily just another case of creation. If God created mankind in the beginning, no matter what form of it you accept or reject, then what prevents Him for creating another human. This time He just created the other half of the genes that Mary did not provide. Please understand, I am not saying that God had sex with Mary and she conceived a child. I am saying that God created the rest of the genes and used them to complete the child in Mary, thus she got pregnant, thus she gave birth. Therefore, in my mind, even if we could DNA test Jesus, he would be haploid. God just created the other half.