The mechanism for a person being drawn to another person's genetic similarities is complicated and multifaceted
People tend to choose spouses who have similar DNA, according to scientists who report the results of a study exploring the genetic resemblance of married couples.
The researchers examined the genetic blueprints of 825 US married couples and found a significant preference for a spouse with DNA similarities across the entire human genome.
The study compared this affinity for husbands or wives with similar DNA makeup to the well-established and strong tendency of people to marry mates with similar educational levels.