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.
It can also help to earn an interior design consultant certificate, which may be completed on its own or in conjunction with a diploma or associate's degree program in a related field. Courses in these certificate programs include marketing, visual merchandising and interior design planning.