Polygenic traits are traits determined by the combined effect of more than one pair of genes. Human stature is an example of this trait. The size of all body parts from head to foot combined determines height. The size of each individual body part are determined by numerous genes.
Although you don't necessarily have to major in interior design, a bachelor's degree or higher in the discipline provides the best foundation for a career, according to the Foundation for Interior Design Education and Research.
Designers may need a bachelor's degree, especially if they're planning to work for a large game studio. Although some schools offer a degree in game design, aspiring game designers can get the necessary training from computer science, software engineering or related degree programs.