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.
I have a BA in Interior Design, I did six months of dental assistant work in Hawaii with no experience before I went off to school for Interior Design. Interior Design is not doing so hot and the BA degree isn't helping me get a job period making more than 11 per hour.