https://pubmed.ncbi.nlm.nih.gov/19619260/ """Nevertheless, it has been estimated that 74% of the variance in human eye colour can be explained by one interval on chromosome 15 that contains the OCA2 gene"""

That's about blue/brown, and realistically, there are a bunch of other genes which also have effects, as "eye color" is really a collection of phenotypes, not just a single one.

...And yet phrenology was a thing.

https://en.m.wikipedia.org/wiki/Phrenology

Never underestimate the willingness to engage in the days new "not-yet-clearly-identified-as-quackery-pseudo science" when there is a buck to be made.

maybe not but you can be assured they'll share whatever information they can predict with some degree of confidence with their 'partners'. Imaging FB getting a hold of you dna data (hashed up but still) and pairing it with eyeballs and other info from their AR/VR headsets.

ADHD has genetic markers for example

>> I wonder if