Journal of Evolutionary Biology. Environmental Sex Determination. There are certainly many known examples of fish and amphibians with GSD, in which both high and low incubation temperatures can cause sex reversal.
In the s, David Crews, a biologist at the University of Texas at Austinand colleagues found that some environmental pollutants caused sex-altering effects in turtles and other reptiles.
CrewsJ. Synergism between temperature and estradiol: a common pathway in turtle sex determination? It is quite possible that there are other species of reptiles with more complicated scenarios of temperature reversal of chromosomal sex.
View on PubMed. Skipper and T. Publication Type. Inamdar, … S.
Sign up for our email newsletter. View on PubMed. This evolutionary model, called the Charnov-Bull model, outlines the conditions under which the evolution of environmental sex determination occurs, and scientists later applied it to vertebrates with TSD.
Sex Chromosomes and Sex-Linked Genes. Ohno, Susumu. 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.
Received May 28; Accepted Aug Mech Dev. We have confirmed that temperature influences expression of these genes using independent biological samples and quantitative PCR using the methods described in Rhen et al. For example, there is an Australian skink lizard that is genotypically governed by X and Y sex chromosomes.
This primordium, also called the genital ridge, forms as an outgrowth of cells from the mesonephric portion of the embryonic kidney. Another example in which sex determination is affected by the location of the organism is the case of the slipper snail Crepidula fornicata.