The interwebs say cats have XY sex determination, and that the orange color gene is on the X chromosome and is recessive. So a male cat with an orange X will be orange, but a female cat needs both X's to be orange to be orange (a female cat with one orange X and one non-orange X will likely show as tortoise shell or calico). Assuming equal probability (P) of each X chromosome being orange so we have a chance at modelling, the males will have P chance of being orange, and females would have P * P chance. Assuming cats have evenly distributed sex,

If P is 90%, 90% of males are orange, and 81% of females are orange; and 47% of orange cats are female. If P is 10%, 10% of males are orange, 1% of females are orange, and ~ 91% of orange cats are male, ~ 9% are female.