Genetic Similarity Theory is a theory, first though of by JP Rushton, that states that altruism is heritable. In Rushton’s beginning years in psychology, he began his research on altruism, having authored 2 books on the subject.
The theory itself holds that people will be more altruistic to genetically similar people than to people more genetically distant from themselves. European peoples are the most altruistic, having weathered the Ice Age for tens of thousands of years, leading to more group cooperation and more trust in the societies, that we still see today.
I have seen some people. like Jayman state that “Ethnic Genetic Interests Don’t Exist and Neither Does Group Selection”. That is so ridiculous, where do I start?
Well first off, we are genetically close to our friends, research shows that our close friends are as similar to us as 4th cousins. We also have altruistic behavior towards our friends, I would assume, because of genetic similarity. That same altruism for people with your genetics had our ancestors weather the Ice Age and led to the development of altruistic behavior and high trust societies.
We know that Europeans are the most altruistic peoples, so with that innate altruism, it obviously helped group selection in the Ice Age to select for more altruism, which led to high trust between them.
There are neurological reasons for having more altruistic behavior for your own people. To quote from the paper Oxytocin promotes human ethnocentrism:
Human ethnocentrism—the tendency to view one’s group as centrally important and superior to other groups—creates intergroup bias that fuels prejudice, xenophobia, and intergroup violence. Grounded in the idea that ethnocentrism also facilitates within-group trust, cooperation, and coordination, we conjecture that ethnocentrism may be modulated by brain oxytocin, a peptide shown to promote cooperation among in-group members.
Results show that oxytocin creates intergroup bias because oxytocin motivates in-group favoritism and, to a lesser extent, out-group derogation. These findings call into question the view of oxytocin as an indiscriminate “love drug” or “cuddle chemical” and suggest that oxytocin has a role in the emergence of intergroup conflict and violence.
There is a genetic basis for ‘racism’, it’s actually called human ethnocentrism, but that doesn’t stop people from creating new buzzwords in order to make a person appear like they’re unintelligent and barbaric for going against the hivemind of political correctness.
Now that we know the reasons for human ethnocentrism, let’s talk about the ‘selfish gene’.
George R Price, a physical chemist later turned science journalist, developed his theory with a math equation. He later had a conversion to Christianity and set out to disprove his theory. No matter what he did, people would take advantage of him. He later killed himself because he couldn’t disprove his theory.
Now, you may say that that disproves ethnic genetic interests as well as group selection, but, the Price Equation is still the widely held to be the best mathematical, biological and evolutionary representation of altruism.
In a paper in which Price was the co-author, he applied Game Theory to evolutionary biology. Game theory is a model that looks at relationships between people in a particular model and attempts to predict their optimal decisions. To quote from the paper he co-authored, The Logic of Animal Conflict:
Conflicts between animals of the same species usually are of “limited war” type, not causing serious injury. This is often explained as due to group or species selection for behaviour benefiting the species rather than individuals. Game theory and computer simulation analyses show, however, that a “limited war” strategy benefits individual animals as well as the species.
So we can see here, that conflicts between those of the same species are of ‘limited war’ and not causing serious injury. That is because of genetic similarity.
Price also stated that in the same way an organism might sacrifice itself to spread its genes, that same organism will sacrifice itself to eliminate those of the same species if it enabled closely related organisms to better spread their genes.
So, what Price stated right there, as well as his 2 papers, directly refute what Jayman says on this.
Altruism, ethnic genetic differences, and group selection all do exist within humanity, though at different rates in different populations.