From an answer to the question Can stem cells from male convert to cells of female-only organs, and vice versa?
Y chromosome is the sex determining chromosome with SRY gene that determines testes development. Absence of the Y chromosome leads to female development by default. That is why XX forms women and there are people with only one X chromosome which are women. (Turner's syndrome)
The Y has only a few genes (less than all other chromosomes), but it has genes that occur only on the Y. One of these in particular, the one called SRY, is the main gene that causes the individual to develop male characteristics. It mostly does its job indirectly, by making a protein that affects many other genes on other chromosomes that in turn do the work of building and maintaining the male form... they managed to cause mice without a Y chromosome to develop many male characteristics. They did this by faking one or two of the actions of SRY. One of the many actions of SRY is to turn on a gene called Sox9 (which is on a non-Y chromosome), and it turns out Sox9 causes most of the things that make the male mouse form.
My question: Is it possible to make a Turner syndrome patient develop male characteristics by artificial stimulation? Has it ever been tried?