New research suggests that we have a tendancy to befriend people who have similar DNA to our own.
The study, which involved comparing the DNA of unrelated friends, found that the people we tend to choose as friends can often turn out to be as genetically similar to ourselves as two people who happen to share great-great-great grandparents.
This could explain why some people you hit it off easy with from the stat.
I wonder if the similar genes thing also applies to romantic relationships?
If the woman is on the pill she picks partners with a similar immune system and if she isn't then men with different immune systems. The ones on the pill, unknown to them, are picking poor partners because of the hormones altering who they find attractive.
As people immigrate to countries they generally tend to settle in areas where there are others of the same heritage so naturally their chances of having friends with the same dna isn't unusual.Where I grew up,every town was a different nationality,and as their populations grew their was more mixing with people from other towns nearby.