Danoff
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This is why the differentiation I made between habits/sociolisation and biology is as important. If it where properties engrained in us (biological) we wouldn't be able to change. When it's due to sociolisation it's not engrained in our dna to hald these biases and we can change these things for the better.
It is, to an extent, ingrained in our dna to hold biases. Social grouping, mating within the group, and xenophobia are all designed to help propagate a set of genes. You're predisposed to favor people that look like you because those people carry more of the genes that you carry. It's not entirely due to culture, some of it is just plain genetic preference designed by natural selection acting on genes. Genes which help themselves propagate (even in the bodies of other organisms) do better in the gene pool than genes that do not.
Also in our DNA is a propensity to bear many offspring, and abandon our partners once our offspring are near self-sufficiency before they abandon us so that we can go off and procreate more. And men and women have different genetic social propensities based on their particular biological processes.
Here are some things that are not encoded in our DNA:
- skydiving
- reacting calmly to being physically attacked
- refusing superstition in favor of logic and evidence
- choosing healthier food and regulating intake
We have particular biological impulses and predispositions, but modern civilization is a non-stop demonstration of our ability to overcome those propensities once we understand them. As Richard Dawkins said (who I am channeling in a big way in this post), we're the only species we know of that has the ability to recognize what our genes want us to do and disrupt those plans in favor of reason, logic, and intellectual thought.