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Which of the following environmental factors plays a role in sex determination of few reptiles?
Pressure
Water
Soil
Temperature
Temperature
In many reptiles (such as certain species of turtles, lizards, and crocodiles), sex determination is not controlled by sex chromosomes, but rather by the incubation temperature of the eggs during a critical period of embryonic development. This phenomenon is known as Temperature-Dependent Sex Determination (TSD).
In many reptiles (such as certain species of turtles, lizards, and crocodiles), sex determination is not controlled by sex chromosomes, but rather by the incubation temperature of the eggs during a critical period of embryonic development. This phenomenon is known as Temperature-Dependent Sex Determination (TSD).
Just like baking a cake where the oven temperature determines whether it turns out a certain way, the temperature of the sand or soil where reptile eggs are buried acts as a thermostat that dictates the sex of the hatchlings.
TSD = Temperature Sex Determination (Think: Thermostat for Tortoises/Turtles)
The temperature during embryonic development influences hormonal pathways, particularly the activity of enzymes like aromatase which converts androgens to estrogens. Different temperature thresholds lead to the development of either all-male or all-female offspring depending on the specific reptile species.
Temperature-Dependent Sex Determination (TSD) occurs in many reptiles including most turtles, crocodilians, and some lizards.
The sex of the embryo is determined by the nest temperature during the middle third of embryonic development.
Unlike humans and birds where sex is genetically determined by chromosomes (XX/XY or ZZ/ZW), TSD relies entirely on environmental cues.
Allows adaptation to local thermal environments.
Ensures hatching occurs in optimal seasonal periods.
Highly vulnerable to rapid global climate change and habitat warming, potentially leading to skewed sex ratios.
Conservation biology and management of endangered turtle and crocodile nesting sites.
Artificial incubation in breeding centers and wildlife sanctuaries.
Options A (Pressure), B (Water), and C (Soil) do not act as the primary physiological triggers for sex determination in reptiles.
Soil can indirectly affect sex determination only via its temperature profile, but the direct physiological factor is Temperature.
D is correct тАФ Temperature is the environmental factor that plays a crucial role in sex determination in few reptiles (TSD).
Remember that while mammals and birds use genetic sex determination (XY and ZW systems), many reptiles rely on TSD, making them unique indicators for climate change studies.
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