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The problem with this explanation is that mammals have greater male variability, and birds have greater female variability, and the obvious cause [1] is that it
by SamReidHughes 5y ago
The problem with this explanation is that mammals have greater male variability, and birds have greater female variability, and the obvious cause [1] is that it depends on which side has more redundancy in their sex chromosomes.
https://onlinelibrary.wiley.com/cms/asset/32d94fa6-e5a8-4c82-a35b-3ff327c0cf58/evo12224-fig-0002-m.jpg https://onlinelibrary.wiley.com/cms/asset/32d94fa6-e5a8-4c82...
[1] Well, I have to say, it was obvious to me, back in middle school, though I didn't know about the mechanics of X chromosome mosaicism at the time. It'd have been pretty weird if none of the information used to construct the brain was on the X chromosome.
- causality0 5y agoInteresting. I wonder how that's influenced by the fact birds have specific reproductive seasons and 90% of bird species only take a single mate per season. A male bird doesn't really have the possibility of being hundreds of times as reproductively successful as another male bird.
- SamReidHughes 5y agoWell, the evolutionary split on that difference is a long time ago, so the causality could only be in the opposite direction. It'd be pretty neat if there was a large relationship between sex chromosome size and species' mating patterns.