In this case—which governs all snake species—males are the homogametic sex ZZ and females are the heterogametic sex ZW. PLOS Biology. Already a subscriber? For example, in many turtle species, eggs from cooler nests hatch as all males, and eggs from warmer nests hatch as all females.
Temperature pulses during the thermosensitive period are often sufficient to determine sex, but after the TSP, sex is unresponsive to temperature. An Introduction to Behavioral Endocrinology.
A widely held view is that temperature-dependent and genotypic sex determination are mutually exclusive, incompatible mechanisms—in other words, a reptile's sex is never under the influence of both sex chromosomes and environmental temperature.
James J. Evolution; International Journal of Organic Evolution. Celebrating Years of Discovery. Removing her eye has given her back her quality of life, she is a very happy girl again. The distribution of the dye looks reptile sex determination in Wiluna in males and females which allows us to determine the gender.
Conservation Biology. Temperature pulses during the thermosensitive period are often sufficient to determine sex, but after the TSP, sex is unresponsive to temperature. Woodland clams are a thing!
Adams Apparently, in animals where both occur, certain incubation temperatures can "reverse" the genotypic sex of an embryo. Many species—such as several species of turtle and lizards, like the green iguana—have X and Y sex chromosomes again, like mammals , with females being "homogametic," that is, having two identical X chromosomes.
Studying the spotted skink, they observed that the highland population was not affected by temperature, yet, there was a negative correlation between annual temperature and cohort sex ratios in the lowlands.