Sex determination Pond Slider
This is an inherited trait, not a morph. Nobody breeds for it.
Shen et al. (2023): "To determine the functional role of Cyp19a1 in turtle ovarian determination, we established loss- and gain-of function models through in ovo lentivirus-mediated genetic manipulation. ... our results suggest that Cyp19a1 is both necessary and sufficient for ovarian determination in the red-eared slider turtle, establishing causality and a direct genetic link between aromatase and reptilian sex determination and differentiation." This phene includes references to studies involving gene edited or genetically modified organisms (GMO).
Offspring odds
No numbers for this one.
No inheritance mode has been recorded for Sex determination, so no offspring odds are given. Guessing one would be worse than saying nothing: a breeder would plan a season on it.
What this rests on
A peer-reviewed paper identifies the variant behind this morph.
- Loss- and gain-of-function analyses reveal the essential role of Cyp19a1 in ovarian determination of the red-eared slider turtle. — Genetics 2023
- Molecular basis for thermal switch of temperature-dependent sex determination in a turtle species. — Sci Bull (Beijing) 2025
- Genetic and environmental drivers of sex determination in turtles: insights and implications for conservation. — Mol Biol Rep 2026