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Sex-determining mechanisms in reptiles are broadly divided into two main categories genotypic sex determination (gsd) and temperature-dependent sex determination (tsd). Two factors in reptile sex determination have been studied (1) the presence or absence of heteromorphic sex chromosomes, and (2) the influence of temperature. Recognizable sex chromosomes are common in snakes and lizards, but are apparently rare in turtles and absent in crocodilians and the tuatara. Temperature-dependent sex determination (tsd) is a type of environmental sex determination in which the temperatures experienced during embryoniclarval development determine the sex of the offspring. Tsd differs from the chromosomal sex-determination systemscommon among vertebrates. It is the most popular and most studied type of environmental sex determination (esd). Thermosensitive periods (tsp) of sex determination in reptiles (modified from shine, r. In tuatara, turtles, and crocodilians, oviposition occurs at very early stages of embryonic development (andrews, 2004), but in lizards oviposition occurs later in development at a stage close to the onset of the tsp. Sexdetermining mechanisms (sdms) can be categorized according to the primary causal agent of sex determination. Under environmental sex determination (esd), sex is established by a nongenetic cue (e. Nutrient availability) experienced within a discrete period after conception (). In contrast, genotypic sex determination (gsd) occurs when sex is established by genetic factors. For example, the most common form of esd is temperature-dependent sex determination (tsd), whereby incubation temperature determines offspring sex in many reptiles 5 and some fish 7. Genomic structure and sex determination in squamate reptiles. Squamata is the largest reptilian order including snakes and lizards which occupies a key position in phylogeny of amniotes. A variety of sex determination modes in lizards is one of the most interesting parts of the biology of this order.

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