Earlier quoted context omitted.
Even acknowledging the basic fact that males have more diverse expression is touchy these days on its own, I find; possibly because people are upset that men and women won't simply be hammered into the same form.
You guys mind backing up your facts? > The simple answer comes down to the fact that a species has to find a balance between maintaining genetic diversity, which is important for resilience and adaptation, and maintaining a strong breeding population. > the basic fact that males have more diverse expression Not to be a jerk, but you guys are just throwing out this stuff without backing it up and it's not at all self-…
The Y chromosome only codes for 55 genes, while the X chromosome codes for 900 genes [1].
The Y chromosome self-evidently doesn't contain genes necessary for basic survival, because females don't have it.
Males have only one X chromosome.
Each cell in a human female has one X chromosome fully active and another one partially active [2], which means their phenotype, as far at it depends on the X chromosome, has lower variance because of partial averaging.
[1] https://www.genome.gov/about-genomics/fact-sheets/Y-Chromoso...