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Animal Biology Sheds Light on Bearded Dragon Sex Determination

The sex of central bearded dragon hatchlings is determined by the prevailing temperature during incubation. Some females carry male genes and behave like males. They are more confident and active than other females. The "tomboys" also have more offspring. Australian central bearded dragon Of great interest is how genetic and climatic factors affect gender. In lab test incubation, if the temperature was over 32 degrees females with male chromosomes hatched as females. Below 32 degrees the dragon expressed its genetic disposition and hatched as males. High temperature females were larger than males which is normal for the species. It appears that male type behaviors of these females is genetically determined. Some of the females were even bolder than normal males. Male chromosomes affect the brain which is driven to express male traits. Only one other animal has the feature of environmental and genetic factors determining sex - the skink. Other animal