I am writing a genetics guide for my fictional cats. I know that most of it isn't actual cat genetics but it is still genetics. There is 1 particular set of pattern genes that is more commonly expressed in females than in males, the lion pattern. I haven't decided yet whether it should be dominant or recessive but since it is rare, I think it should be recessive. I figured since males rarely have this that it should be X linked. But then again, X linked usually means more common in males or equal precedence in both sexes, not more common in females. So how could this be? First off, there is the pattern itself. This is age dependent, not sex dependent. So X linked dominant would work for this. But the pattern itself changes with age. The kittens are born with rosettes and simple spots, just like this lion cub: As they grow older the rosettes disappear but there are still simple spots: And finally, here is the sex dependent part of this lion pattern. Once they are fully grown, the spots either completely disappear like in most cases or uncommonly, stay there, primarily on the belly and chest. Out of these cases of spot retention, most of them are females. Males rarely retain their spots but there are a few cases of spot retention in males. Here, you can see spots on the chest of this very pale lioness, no rosettes, just simple spots. And here is a picture of a very pale male lion that has spots. Spots in male lions are rarer than spots in lionesses. But my question is, how could this spot retention be X linked and more common in females? The only two ways that I can think of an X linked gene being more common in females is that: 1) An X linked gene is connected to another X linked gene and that other X linked gene is connected to an autosomal gene. Females have double the gene expression and thus are more likely to have spot retention. or 2) A Y linked gene produces a protein that inhibits spot retention in males. But in the very rare case that this Y linked gene itself is inhibited, the males have spot retention. But is there anything else besides a chain of genes that could make something that is X linked more common in females instead of in males?