What do you want in a spouse? Genetic similarity may help

Mon May 19, 2014 5:02pm EDT
 
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By Will Dunham

WASHINGTON (Reuters) - He leaves the toilet seat up, prefers old Japanese monster movies to romantic comedies and fancies mixed martial arts over ballet. So what do you have in common with your husband?

More than you may think.

People tend to choose spouses who have similar DNA, according to scientists who reported on Monday the results of a study exploring the genetic resemblance of married couples.

The researchers examined the genetic blueprints of 825 U.S. 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. The researchers found that the preference for a genetically similar spouse was about a third as strong as the preference for a spouse with comparable education.

The 1,650 people studied in the research were non-Hispanic, white men and women born between the 1930s and 1950s who were taking part in a broader U.S. government-funded study involving health and retirement.

"We do know in some sense that people prefer genetically similar spouses because we know that people tend to date and marry within their own racial and ethnic groups. We worked really hard in this study to not just replicate that fact," said researcher Benjamin Domingue of the University of Colorado's Institute of Behavioral Science, who led the study.

"We eliminated racial variability and tried to control for ethnic variability. And we still find a preference for genetically similar individuals," Domingue added.   Continued...