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.
Starting an interior design business may require that you take certain courses, or even complete an associate or bachelor degree in interior design. 18 states have licensing requirements, requiring an individual who wants to start an interior design business to pass a state examination.