This alone can be beneficial and an advantage of eugenics. Parents can see the likelihood of their future children being born with a disorder and explore different options. They would be ready to meet the medical needs of their children if they wanted to conceive. Genetic modification can also allow parents to choose the sex of their child, this is not as beneficial but can be useful in countries like China where the number of children is limited. In addition to gender, genetic modification can allow for the appearance of certain traits such as mental disorders