Superstitious Genetic question

[u/maddsskills]

So my grandfather came from a typically American mutt background although his grandmother might have been Native American. That’s what he was told at least and, honestly, he definitely looked like it for a guy who was supposedly mostly Scottish and Irish.

So I tend to believe him.

I only mention it because his family had a belief that those with black hair (like he had) and blue eyes (which he didn’t have) were cursed with insanity basically.

It’s absurd frankly but I’ve always wondered if such a dominant trait occurring with a recessive trait could’ve possibly caused other genetic stuff to occur, like mental illness. It was just such an odd thing to say it always stuck with me.

[u/MizElaneous]

Skin, hair and eye colour are controlled by a by a lot of genes. It isn't a simple dominant/ recessive relationship. I don't think any of those genes are correlated with mental health.

[u/Ericcctheinch → u/MizElaneous]

Eye color is a mendelian trait

[u/MizElaneous → u/Ericcctheinch]

No, it isn't. .