Disassortative mating reduces the genetic similarities within the family.Positive assortative mating occurs more frequently than negative assortative mating.p=4103 Prediction: Good dating sites of the future will use genomic data to select partners with matching MHC. Dating sites can extract the info about MHC (and whatever else!

But there are a few firms that will, with rare exceptions, make offers only to the top students (those who make the law review) at the most elite law schools.

The basic idea is that people sort into partnerships or groups in a manner that is non-random and, in particular, can be “ordered.” So in the strictest version of positive assortative mating, the “best” woman would be mated to the “best” man, the second-best to the second-best, and so on.

When we see positive assortative mating, it will generally be the case that it leads to a “better” outcome than if people (or lawyers and firms) matched randomly. Suppose that Addison is a very beautiful woman and Chris is homely.

At the start of the semester, they asked students in small classes to rate the desirability of their classmates.

(Desirability could incorporate non-physical attributes as well as good looks.) When the researchers looked at the ratings, they found that most students agreed on who was hot and who was not.