The growth of male- or female-specific phenotypes in squamates is usually managed by either temperature-dependent intercourse dedication (TSD) or chromosome-based hereditary intercourse determination (GSD). Nevertheless, while intercourse determination is a major switch in specific phenotypic development, it really is unknownhow evolutionary transitions between GSD and TSD might effect on the evolution of squamate phenotypes, especially the fast-evolving and diverse genitalia. right Here, we make the initial possibility of learning the effect of both sex dedication mechanisms from the embryological growth of the main dragon that is beardedPogona vitticeps). This can be feasible because of the transitional intercourse determination system with this species, by which genetically male people reverse intercourse at high incubation conditions. This could trigger the evolutionary transition of GSD to TSD in a generation that is single making P. vitticeps a perfect model system for comparing the results of both sex determination processes in identical types.
We carried out four incubation experiments on 265 P. vitticeps eggs, addressing two heat regimes (“normal” at 28 °C and “sex reversing” at 36 °C) in addition to two maternal intimate genotypes (concordant ZW females or sex-reversed ZZ females). Out of this, we provide the very first staging that is detailed when it comes to types, having a give attention to genital and limb development. This is augmented by way of a sex that is new recognition methodology for P. vitticeps that is non-destructive towards the embryo. Lire la suite