Cowardly, the code of marriage code is right?

A new study finds that people tend to look for partners who have DNA similarities with themselves. That proves that the proverb "naughty coward, code code" in marriage is right.

Many studies have shown that people tend to marry people who share common ground with their educational background, social class, race and even body weight. This phenomenon is called "proportional marriage".

Couples found to have more DNA similarities than random couples.(Artwork: Shutterstock)

The question for researchers is whether the differences in "proportionate marriage" are pronounced at the genetic level. Benjamin Domingue, a researcher from the University of Colorado (USA), and colleagues analyzed the genetic data of 825 white Americans, not of Spanish and Portuguese descent. They conducted a comparison of DNA similarities between couples with the similarity of unmarried individuals.

The results revealed, couples have more similar DNA fragments than randomly selected couples. However, the team found that genes only occupy a small position in many of the features used by humans to search for their "half" , including geographic origins, intelligence, education, .

Experts discovered that, after controlling the educational foundation and education, the influence of genetics was reduced by 42%. In general, education and education levels are three times greater than individuals' decisions to choose a husband and wife.

According to experts, although there is only a small impact, the genetic similarity affects marriage. The team concludes that the decision to choose a wife and choose a husband is ultimately not genetically random.