Scientists from University of California and Yale have found that the friends are pretty similar when it comes to genetics. They are much more similar than strangers within the same population. The focus was turned to the 1,932 participants that were in the 1948 Framingham Heart Study. Gene variations were compared between sets of two unrelated friends and sets two unrelated strangers. Results showed that 1 percent of the gene were shared between friends. The other factor they observed was whether the friends came from the same ethnicity. Majority of the participants in the Framingham Heart Study originated from Europe. This just meant that they came from the same population.
This finding also proves that the similar genes that friends have are evolving faster than other ones. So, the social environments are very important to evolution.
http://blogs.discovermagazine.com/d-brief/2014/07/14/friends-share-similar-genes/
https://www.framinghamheartstudy.org/about-fhs/index.php
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