Environmental regulation of sex determination in reptiles vs amphibians in Wiltshire

The scope of the model for other reptiles, however, requires further research. Turtle species that display TSD are thought to follow one of two patterns of temperature dependence. Nicole Valenzuela and Valentine Lance, 5—8. Young individuals are always male.

If the snail is attached to a female, it will become male. After Coe

Location-dependent sex determination in Bonellia and Crepidula As mentioned in Chapter 3, the sex of the echiuroid worm Bonellia depends on where a larva settles. Gilbert SF. After Coe By agreement with the publisher, this book is accessible by the search feature, but cannot be browsed.

As ofsixty-five of seventy-nine tested species of turtles were found to exhibit TSD. Sources Bull, James. PCBs can act as an estrogen replacement, causing feminization of sex organs in growing reptiles.

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The consequences of TSD on fitness, or reproductive success, are largely unknown. Please review our privacy policy. When two species of turtles were raised at female-promoting temperatures, Sox9 expression was down-regulated during the critical time for sex determination.

By agreement with the publisher, this book is accessible by the search feature, but cannot be browsed. Developmental biology 8th ed. Nature has provided many variations on her masterpiece. 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

The processes of primary sex differentiation are considered to involve exposure to a dose of some male-determining factor during a specific quantum of developmental time during early incubation. Sunderland MA : Sinauer Associates ; Young individuals are always male.

Environmental regulation of sex determination in reptiles vs amphibians in Wiltshire

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