What does the movie gattaca say about dna determining a person's potential?

The movie was focused on the idea that our genetics will predestine people with success or failure. However, the main character showed that genetics is only a part that makes us physically, there are still other aspects that will determine other's faith, like their values.

Person potential has everything to do with DNA. If one has a perfect DNA therefore no illness and the person is able of doing different tasks. The DNA potential make sure that the children has the best hereditary traits of their parent and Children are conceived normally