Is Tang's son a relative of the man or the woman?

Down syndrome is also called 2 1 trisomy syndrome. It shows that the patient has one more chromosome 2 1 than normal people, a total of three, which belongs to chromosome disease.

Down's syndrome may be caused by sperm or egg formation, meiosis or chromosome separation during fertilized egg development, which may lead to this disease.

In short, it may be caused by the man or the woman. However, in many cases, there is more than one egg. That is, it is more likely to have a relationship with the woman.

But the specific reason still needs to be known to the doctor.