Mention genetic traits and most of us think of a person's appearance and talents. But the effects of one's genetic inheritance extend well beyond these relatively superficial traits.
While parental nurturing is important, primarily by creating an atmosphere in which their child's genetic traits can be fully expressed, his/her tools for succeeding in life are, in my opinion, more innate. Genes also code for our level of intelligence, creativity, self-confidence, risk tolerance, perseverance and drive to excel. One's social status may facilitate the process, but personal achievement is governed by internal factors. History is replete with individuals who rose from poverty, tragedy or abuse to positions of leadership in their chosen field; by contrast, some persons, granted wealth and unlimited opportunity, fail to meet the expectations of others.
As the saying goes, we cannot choose our parents. But their gifts, however unintentional, are what determine our ability to succeed.