Temperature Variation and Sex Determination in Reptilia

Redescription and geographical variation of Monopeltis guentheri Boulenger (Amphisbaenia, Reptilia)

Molecular evolution of Dmrt1 accompanies change of sex-determining mechanisms in reptilia.

In reptiles, sex-determining mechanisms have evolved repeatedly and reversibly between genotypic and temperature-dependent sex determination. The gene Dmrt1 directs male determination in chicken (and presumably other birds), and regulates sex differentiation in animals as distantly related as fruit flies, nematodes and humans. Here, we show a consistent molecular difference in Dmrt1 between rep...

Variability in sex-determining mechanisms influences genome complexity in reptilia.

In this review, we describe the history of amniote sex determination as a classic example of Darwinian evolution. We suggest that evolutionary changes in sex determination provide a foundation for understanding important aspects of chromosome and genome organization that otherwise appear haphazard in their origins and contents. Species with genotypic sex determination often possess heteromorphi...

Correlation of the Pathogenic Bacteria Isolated from Sputum Samples with Age, Sex, Seasonal Variation and Determination of Their Antibiotic Resistance Pattern

Background and Objective: In the current study, the relevance of the respiratory infection with the age, sex, and seasonal variation of the year were studied side by side with the determination of the responsible bacterial pathogen and their antibiotic sensitivity patterns. Materials and Methods: One hundred sputum samples were collected to determine the causative bacteria of respiratory distr...

Mutual information reveals variation in temperature-dependent sex determination in response to environmental fluctuation, lifespan and selection.

Quantifying the degree to which sex determination depends on the environment can yield insight into the evolution, ecological dynamics, and functional aspects of sex determination. In temperature-dependent sex determination (TSD), theory often predicts a complete dependence of sex on temperature, with a switch-like reaction norm. However, empirical data suggest more shallow relationships betwee...