nostr:npub1e8reh2nav2zsxvkuqhpmgfh7ujjwq8zur2w9mpllu5yy4yvenrhs8av8cz
Genetics is the opposite of skin-deep.
It's a big topic, but basically unless you reject Darwin wholly, genetics codes for abilities and inclinations.
Groups that are similar form ethnes or ethnic groups.
Those produce culture because it is wired into them.
Combining cultures destroys this.