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> ”Research has shown that all sloths have a rare genetic condition called ‘rod monochromacy’” Weird phrasing. All of them having something that is rare means
by soneca 2y ago
> ”Research has shown that all sloths have a rare genetic condition called ‘rod monochromacy’”
Weird phrasing. All of them having something that is rare means it is not rare at all, right? And if all of them have it, it is not a “condition”, it is their genes, how they are.
- Retric 2y agoIt’s rare among mammals in general even if it’s universal for sloths. Most people think of evolution as a string of improvements, however you can get negative traits in a population from a large enough genetic bottleneck or spread by being next to a very useful mutation. So it’s not necessarily an advantage for them, it could have just been bad luck. Alternatively, there could have been some selective pressure for it as a means of improving night vision or something, we just don’t know.