Chromosomes, the Definition of "Human," and the United Nations

To what extent do prenatal screening tests, which can assess the probability of having a fetus with Down syndrome, affect humans’ quality of life in the world? Can these screening tests tell us how much a fetus will not be afraid of telling the truth in the future? Can they tell us how well a fetus can have acceptable behavior in the future? Can such screening tests be 100% accurate in determining what kind of fetuses will not murder others, steal things, or cause corruption on planet Earth? Which of these screening tests can tell us how the quality of life of these fetuses, who are human beings, will be like or what kind of fetuses will live in a way that they will never disgrace human dignity? Can these prenatal screening tests indicate how the fetuses that are considered defective by carrying out these tests and based on their results would live and how they would influence other people’s lives and can they compare these fetuses’ impacts on the world around them with the influences of fetuses that are described as healthy fetuses who are regarded worthy of life in the future?