While sex hormones have been observed to be influenced by temperature, thus potentially altering sexual phenotypes, specific genes in the gonadal differentiation pathway display temperature influenced expression. Recent studies Bergeron et al.
Sex-determining mechanisms in reptiles are broadly divided into two main categories: genotypic sex determination GSD and temperature-dependent sex determination TSD. Sources Bull, James. The thermosensitive, or temperature-sensitive, period TSP is the period during development when sex is irreversibly determined.
They did so to test the predictions of the Charnov-Bull model. Temperature-Dependent Sex Determination in Reptiles The sex of a reptile embryo partly results from the production of sex hormones during development, and one such process to produce those hormones depends on temperature of the embryo's environment.
January, Researchers must also measure the survival of that individual's offspring to sexual maturity. New Jersey: Pearson Education,
The pathways toward maleness and femaleness in reptiles are just being delineated. However, there is no evidence thus far that sex ratio is manipulated by parental care. Another example in which sex determination is affected by the location of the organism is the case of the slipper snail Crepidula fornicata.
PCBs can act as an estrogen replacement, causing feminization of sex organs in growing reptiles.