While TSD has been observed in many reptile and fish species, the genetic differences between sexes and molecular mechanisms of TSD have not been disclosed. Adams In most species, gender is determined during fertilization. Between these extremes, males predominate.
PLOS One. Categories : Herpetology Sex-determination systems. Namespaces Article Talk. National Center for Biotechnology InformationU. In these reptiles, the temperature of the eggs during a certain period of development is the deciding factor in determining sex, and small changes in temperature can cause dramatic changes in the sex ratio Bull Males, on the other hand, are "heterogametic," with one X chromosome and one Y chromosome.
Valenzuela, Nicole. Turn recording back on. EwertCraig E. How is the external signal of temperature transduced into a genetic signal that determines gonadal sex and channels sexual development? Nature has provided many variations on her masterpiece. Select Format Select format.
Journal of Evolutionary Biology. Developmental Biology. Quarterly Review of Biology.