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.
Educational Requirements. Training to become an interior designer takes two to four years and is available from professional design schools or colleges and universities. One can earn an associate degree or certificate by attending a two to three-year program, or a bachelor's degree by attending a four-year program.