Gene says, "I was subject to the dictates of my mind, which gave me the maneuverability of a strait jacket." Where do Gene's rules for himself come from? Why are they so strict?

This comes from the parents of the gene, how it was created, in this sense it is possible to realize that the parents of the gene are very strict and this made her understand that this is the right way to deal with herself and the situations she is in.

well, there are a lot of places we get information about earth from. like science classes, websites, books, newspapers, etc.