ILAR J. After this period, however, sex reversal is impossible. Nesting ecology and hatching success in the turtle Emydoidea blandingii. Canadian Field Naturalist. Fleming et al.
Differentiation and development of testis in the oviparous lizard, Calotes versicolor Daud. Moreover, the direction of the temperature effect can vary from higher expression at female-determining temperatures to higher expression at male-determining temperatures [ Rhen et al.
But there is a continuum of equilibria spanning from pure chromosomal sex determination to pure environmental sex determination as the average nest temperature increases, and it is a steep transition. Estrogen and sex reversal in turtles: a dose-dependent phenomenon.
Miura I. Iguanas thus show a stability of sex chromosomes comparable to mammals and birds and represent the group with the oldest sex chromosomes currently known among amniotic poikilothermic vertebrates. Heritability of genetic sex determination in reptiles as pets in Port Macquarie ratio in turtles with environmental sex determination.
The most complete models integrate a vast array of data, including a list of all genes expressed in the cell or tissue of interest, the molecular function of those genes, information on cis regulatory elements and trans regulatory factors, and gene expression profiles after numerous gene perturbation experiments [ Bolouri and Davidson, ; Friedman, ].
Correlation among thermosensitive period, estradiol response, and gonad differentiation in the sea turtle Lepidochelys olivacea. Here we review the molecular, cellular, morphological, and physiological changes associated with sex determination in reptiles. Embryological ontogeny of aromatase gene expression in Chrysemys picta and Apalone mutica turtles: Comparative patterns within and across temperature-dependent and genotypic sex-determining mechanisms.
For instance, polychlorinated biphenyls PCBs are pollutants whose molecules are structurally similar to some estrogens. Molecular marker suggests rapid changes of sex-determining mechanisms in Australian dragon lizards.
Global range. Ecol Lett. Journal of Toxicology and Environmental Health Washington: Smithsonian Books, Hunter Jr.