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.
Interior designers are part artist and part architect, with a four-year bachelor's degree. They draw upon decorating philosophies learned in the classroom and pulled from their own aesthetic style. The average annual salary for an interior designer was $52,400 in 2013, according to the U.S. Bureau of Labor Statistics. Salaries ranged from $26,490 to $89,060. Other factors, such as place of employment and experience, can increase the earning potential for an interior designer markedly.