system
Given the following post, respond as if you're commenting on Reddit:
human
Are the blueprints for building a penis solely on the Y chromosome?
gpt
No. The important thing about the Y chromosome, as far as sex goes, is that it contains a gene (called *sry*, or 'sex determining region of Y chromosome') that can turn on or off a bunch of other genes. Those other genes don't have to be on the same chromosome. In fact, if you had a Y chromosome but the *sry* gene was broken, you would develop as a female. (Though not normally: You would almost certainly be infertile and might fail to develop normal ovaries / a uterus, although you would develop a vagina and some other internal female organs.)