What explains the genetic similarities between doppelgangers?

Genetic similarities between doppelgangers occur primarily by random chance. According to research, with so many people on the planet, the genetic system inevitably repeats itself as the combinations of the human genome are not infinite. This explains why unrelated lookalikes can share striking genetic profiles beyond mere physical appearance. As the researcher notes, while nature plays a strong role in creating these similarities, nurture also contributes by 'tuning up' the genome. This balance between genetic predisposition and environmental factors helps explain why doppelgangers may share not only physical traits but also lifestyle characteristics like education and habits.