The choice of friends is determined by DNA. Free Technical Library News

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The choice of friends determines the DNA

05.05.2020

The expression "friends are the family we choose" seems banal only at first glance. Scientists at California and Yale have found that there is more scientific truth to this claim than we might have imagined.

An analysis of the genomes of almost 2000 people showed that we share as much DNA similarity with our friends as with our second or fourth cousins - that is, approximately 1% of similar genes.

This discovery only reinforces the earlier assumption that much of our social behavior (including collective life and altruism) lies in the distribution of a common DNA. Simply put, we are programmed to look for those who can continue to reproduce and pass on genes similar to ours to the next generation.

The study also showed that friends are most similar in the genes that are used for the olfactory process. One possible explanation for this fact is that friends are attracted to the same environment. For example, people who enjoy the smell of coffee are likely to spend a lot of time in cafes where they can meet and make friends with like-minded people.

Some traits controlled by genes can only function if they are shared by friends.

Least of all, friends have the same genes that control the immune system. From an evolutionary standpoint, this makes sense, since having different disease-fighting mechanisms reduces the chances of contracting a large number of diseases.

Genes shared with friends evolve faster than others, suggesting that our social relationships are the driving force behind human evolution.

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