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How is the age of a turtle determined?

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❶They do not have teeth. The female is thus homogametic.

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Developmental Biology. 6th edition.
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Patterns of temperature-dependent sex determination (TSD) in reptiles. Pattern I is found in turtles, e.g. Red-eared slider turtles (Trachemys scripta), Olive Ridley sea turtles (Lepidochelys olivacea), or Painted turtles (Chrysemys picta).

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Temperature-dependent sex determination in reptiles. While the sex of most snakes and most lizards is determined by sex chromosomes at the time of fertilization, the sex of most turtles and all species of crocodilians is determined by the environment after fertilization.

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Sex-determining mechanisms in reptiles are broadly divided into two main categories: genotypic sex determination (GSD) and temperature-dependent sex determination (TSD). Species in the genotypic group, like mammals and birds, have sex chromosomes, which in reptiles come in two major types. Jun 25,  · In most species, gender is determined during fertilization. However, the sex of most turtles, alligators, and crocodiles is determined after fertilization. The temperature of the developing eggs is what decides whether the offspring will be male or female. This is called temperature-dependent sex determination, or TSD.

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Temperature Dependent Sex Determination in Sea Turtles Created Date: Z. The sex of hatchling map turtles is determined by incubation temperature of eggs in the laboratory as well as in nature. Temperature controls sex differentiation rather than causing a differential mortality of sexes. Temperature has no effect on sex determination in a soft-shelled turtle.