Search results for "Sexual differentiation"

Reproductive and developmental phenomena in annelids: a source of exemplary research problems

1999

Specific traits of reproduction, of early and postembryonic development and of sexual maturation in annelids are reported, and the existing and expected contributions to this field from the study of annelids are discussed. The study of early development, as in other spiralians, reveals the existence of canonical cleavage patterns and the combined action of antithetical principles, namely determination by stereotypic sorting-out of ‘determinants’ and determination depending upon the interactions between the blastomeres. A high potential of information about the processes of metameric trunk segment formation and of segment specification has only begun to be exploited in annelids. Epitoky, the…

Gender differences in career plans and wage expectations of French undergraduates

2014

Gender differences in wage expectations may affect investment in human capital and increase inequalities in the labor market. Our research based on a survey of freshmen at a French university aims to understand how students form differences in wage expectations. Our results show that anticipated earnings differ significantly between men and women. One year after graduation, we find a gender pay gap of 16 per cent. A wage decomposition method indicates most of this effect is due to anticipation of discrimination. Ten years after graduation, anticipated discrimination is still almost as dominant in explaining the gender wage gap. Finally, using a survey of recent college graduates we show tha…

How do Wolbachia Symbionts Increase the Proportion of Females in Their Hosts?

2001

The Peculiarities of Gonad Transformation in Teleosts

1983

In teleosts the problem of sex determination and sex differentiation is more puzzling than in other vertebrates. It is not known whether the intriguing variety in the conditions of sex results from the position of these fishes within the vertebrate pedigree. They represent the final products of actinopterygian evolution toward the end of the age of reptiles, that is late in the Jurassic era. However, with that evolutionary fact in mind it is more plausible that teleosts deviate in many ways from the pattern that we are used to attribute to vertebrates in general. The following features of sex differentiation are striking examples of teleost peculiarity: (1) In both sexes there is no morphol…