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Sex determination in adult chameleons is not a difficult matter for most chameleon species, because they most often are sexually dimorphic, meaning males and females are different in form or size. For example, in the majority of species where males have horns, females lack horns. Males are usually larger than females, except in the genera Brookesia and Rhampholeon. Species that are not sexually dimorphic may be different in coloration, or sexually dichromatic, such as Furcifer pardalis. Females of this species are typically a reddish orange or tan marked with brown or black, regardless of geographic locale. Determining the sex of species in the genera Brookesia and Rhampholeon depends primarily on the presence of a bulge at the base of the tail created by paired sexual organs called hemipenes. It is much more difficult to ascertain the sex of juveniles of most species from birth to about six months of age, or whenever the first indication of adult coloration, horns, crests, or a hemipenial bulge becomes apparent.
I may be wrong. What do you mean by sex system? Do you mean vaparity (livebirth) or ovivaparity (eggs)?
possesses 24 chromosomes, 4 of which are microchromosomes (Gorman, 1973). There is no sex chromosomal heteromorphism.