From the start of the movie, therere married people who have a baby born without genetic engineering. When Vincent Anton was born, his physical illnesses or any other problems and his lifespan are estimated in blood test. The result of this test affects his life. So, he is called as an in-valid. When Vincents parent wants to have a child, they used genetic engineering so that their child will have no undesirable traits compared to him. In this way, they can choose their babys physical appearance and remove the bad features of their child. When Vincent search for a job, to achieve his dream to travel space, but when they test him using blood and urine the result is in-valid and because of this he only gets a janitor job. He finds another way to get inside the Gattaca, a man helps him with genetically engineered gene which is Jerome Morrow and because he has a valid gene, he can get the job because in applying a job, they only take results from blood
and urine test if they are valid or not. They dont ask his own interests and other things. Jerome had perfect genes, he could achieve anything until his accident, paralyzing his legs and because of this he is discriminated. So, he used Vincent to pretend to be him. Even that he has a perfect gene, Jerome wants to end his life, because of a failure. However, he had an unsuccessful suicide attempt, so he lives his life in a wheelchair. The movie also shows a pianist who is successful because he has six fingers in each hand. If he is manmade, he would have natural hands and he could not be successful because the melody he played can be played only with twelve fingers. This means, genes dont reflect our future and our lives cannot be chosen.
Therefore, sometimes peoples lacks of something and failures are the reasons for our success in life. The society in this movie has begun to value individuals only on their genetic makeup, instead of personal worth.