The factors contributing to the termination of calling (pheromone release) in adult female Supellu longipalpa were examined. Calling ceases after mating and does not resume over the duration of the insect’s life. Calling was suppressed and basal oiicyte growth was stimulated by the transient presence of a sperrnatophore, by the implantation of an artificial spermatophore, and by mating with vas...

The mink is a seasonal breeder with induced ovulation and delayed implantation. Reproductive processes are strongly influenced by energy supply and body condition. Items for which there is paucity or complete lack of data were the main objectives of this study: the temporal relationship between copulation and the pre-ovulatory LH surge and the influence of energy supply on LH release. A total o...

Previous studies demonstrated that mitochondrial DNA (mtDNA) was uniparentally transmitted in laboratory crosses of the pathogenic yeast Cryptococcus neoformans. To begin understanding the mechanisms, this study examined the potential role of the mating-type locus on mtDNA inheritance in C. neoformans. Using existing isogenic strains (JEC20 and JEC21) that differed only at the mating-type locus...

In Ustilago violacea conjugation involves a period of courtship followed by the cooperative assembly of a conjugation tube between paired sporidia of opposite mating type. During courtship information is exchanged between the paired sporidia directing transcription and translation of a ' sex message'. This information exchange is completed even though the plasma membranes and walls of the matin...

Postcopulatory sexual selection due to sperm competition and/or cryptic female choice has been documented in a diversity of taxonomic groups and is considered a pivotal component of sexual selection. Despite this apparent importance, the relative contribution of postcopulatory fertilization success to overall sexual selection has not yet been measured in any species. Here, we used a laboratory-...

To test the functions of a mating type genes, we developed an efficient strategy to select transformants of Neurospora crassa in which resident A mating type DNA was replaced by cloned DNA from the mt a idiomorph. Cloned a idiomorphic DNA could specify all functions, including fertility, of a mating type, but only when it replaced A DNA at the mating type locus. Only the mt a-1 region of the a ...

Biomphalaria pfeifferi and B. camerunensis are Schistosoma mansoni intermediate hosts. The knowledge of their mating system and mating behaviour is of high interest in mastering the transmission and evolution of a potential resistant gene introduced in a population. This study was therefore conducted to provide further knowledge on the mating behaviour of these two S. mansoni intermediate hosts...

A geometric constraint solving method is presented that takes well-constrained mating conditions between a base and a mating component and directly transforms them into a 4 × 4 matrix that determines the relative orientation and location of the mating component with respect to the base component. In the proposed procedure, the 4 × 4 transformation matrix is determined by directly computing a ro...

In mammalian species there are significant physiological responses of the female reproductive tract to deposition sperm. These particularly notable in where sperm deposited directly into uterus, and function both facilitate transport reservoir, eliminate introduced contaminants. bitch, vagina rapidly transported through open cervix. Sperm then distributed around uterus by uterine contractions s...