Green, while accurate to do so, I find it misleading. I see an X/Y (o.i.) and an X/a system as having more in common with each other than the X/Y (a.y) system. As in the latter the movement of the info to generate the male results in "maleness" only being present in males, whereas in the first 2 systems females contain all of the information a male would appart from the ability to prevent the development of female.
well when I said "its easy to imagine" its more of a way to remember it than an actual causal linkage. though when one chromosome contains the necessary instructions to produce proteins to turn off one group of protein production, and the other needs to prevent the production of (at least but lets call it) 2 proteins, while accepting it would be possible for more nonsense to be present, bulking the chromosome up, it is necessary for that chromosome to contain more usefull info than the first.
well when I said "its easy to imagine" its more of a way to remember it than an actual causal linkage. though when one chromosome contains the necessary instructions to produce proteins to turn off one group of protein production, and the other needs to prevent the production of (at least but lets call it) 2 proteins, while accepting it would be possible for more nonsense to be present, bulking the chromosome up, it is necessary for that chromosome to contain more usefull info than the first.