Experts from the University of East Anglia and the free University of Amsterdam found: only in rare cases does the attraction of opposites. In fact, most people tend to pair them with an equal level of intelligence a person with a similar social status. About it writes edition The Daily Mail.
Finding the pairs amongst animals of all kinds has similar features. The crossing usually occurs at assortative mechanism, when one individual tries to find himself in a few other individual with similar genetic characteristics. However, the mechanism described above leads to the inevitable formation of social inequality.
Genetics with the theory of scientists agree for the most part. Note that in another study the research group from the University of California proved that quite often people forming couples have a resemblance at the level of a third cousin or pateyron brothers and sisters.