Solar power has paved the way for the world of Gattaca to achieve the sources of energy it needs to act as a clean and efficient power source. Technology brings a function to the form of society so it will as in this case mirror the value of sterility.
The evidence for the theme of perseverance can be found in the swimming scenes. Vincent knows that under ordinary circumstances that he cannot beat his brother so the alternative for this is to go with one intention. Either he will give his all and succeed, or he will die in the process, this leaves nothing to chance and everything to the skills that you have earned over a lifetime not your genes.
The main character Vincent, gives an example through his own life experience to the discrimination that he was born into and is now forced to live with. This example starts at the 3 minute and 50 second mark, and reminds us of a time very reminiscent of America during the early segregation movement. Even though the law may “defend” the individual in name only. The persecution that the person faces is still as real as any outward act.