That's what I was thinking. I also like to believe that human women are homogametic XX, men are XY, or heterogametic; though not het for woman, but Y being incomplete dominant for a super-human, and anyone lucky enough to get YY only, would be Superman himself, capable of producing only sons and having both mental and physical powers beyond our comprehension.Chuck Norris and Danzig are possible YY supermen, but the government would make the media keep something like that under wraps, so we can only speculate.
I have a question about some of the triple chromosome humans. Would someone who is XXY have a 66.6 chance of producing daughters, as opposed to the 50% chance of those with the normal XY?