Cite this Page Gilbert SF. Sources Bull, James. Individuals with low levels of aromatase during the thermosensitive period will develop male characteristics. Another hypothesis is that aromatase activity may be regulated by Sox9. Sign in.
Sexual reproduction requires both male and female haploid gametes. The first hypothesis is that there are trade-offs between male and female function, such as when mating displays enhance male fitness but decrease female fitness. The Benefits of Sex ".
Disregarding intermediates, the basic distinction between asexual and sexual reproduction is the way in which the genetic material is processed. Nature —U Such species are called monoecious "one house" or hermaphroditic. Find out more.
After Crain and more Reptiles in which both incubation temperature and sex chromosomes interact to determine sex may represent "transitional" evolutionary states between two end points: complete GSD and complete TSD. Printer-friendly version PDF version.
It is especially challenging to identify the sex of hatchling sea turtles because they lack external sexual organs and heteromorphic sex chromosomes — no X or Y. Port Royal, originally named Cagway was an English harbour town and base of operations for buccaneers and privateers pirates until the great earthquake of By agreement with the publisher, this book is accessible by the search feature, but cannot be browsed.
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. By agreement with the publisher, this book is accessible by the search feature, but cannot be browsed.
We believe that the novel technique we have developed will allow for more accurate estimates of hatchling sex ratios at a population level and on a global scale. More on this topic. However, there is evidence that during climactic extremes, changes in the sex determining mechanism itself to GSD are selected for, particularly in the highly-mutable turtles.