Using the biological species definition, yeasts of the genus Saccharomyces sensu stricto comprise six species and one natural hybrid. Previous work has shown that reproductive isolation between the species is due primarily to sequence divergence acted upon by the mismatch repair system and not due to major gene differences or chromosomal rearrangements. Sequence divergence through mismatch repa...

Prior to 1971, women had some difficulty obtaining contraceptive materials due to a law prohibiting the distribution of contraceptives by anyone other than a registered physician or registered pharmacist. This limited access to contraceptives had an impact on women?s reproductive rights [6] and it was the Supreme Court case Eisenstadt v. Baird (1972) that helped bring the issue into the public ...

An understanding of the molecular mechanisms of speciation (reproductive isolation) is potentially very powerful as it should help us appreciate the processes that differentiate closely related organisms such as humans and chimpanzees. Currently, however, our understanding of such mechanisms is far from complete. The closely related yeast, Saccharomyces cerevisiae and Saccharomyces mikatae, rep...

Understanding the molecular basis of how reproductive isolation evolves between individuals from the same species offers valuable insight into patterns of genetic differentiation as well as the onset of speciation [1, 2]. The yeast Saccharomyces cerevisiae constitutes an ideal model partly due to its vast ecological range, high level of genetic diversity [3-6], and laboratory-amendable sexual r...

The reproductive strategies of Cichlids: Hemichromis fasciatus, Oreochromis niloticus, Sarotherodon galilaeus and Tilapia zillii was studied from June, 2007 to December, 2008. The variability in egg –size (i.e. diameter) were measured using the micrometer eye-piece in a binocular microscope. Fecundity was estimated by direct enumeration and related to the fish species population. The sex ratio ...

S. Prešić ([6]) determined the all reproductive general solutions of the equation r(x) = 1, where r was a unary relation of a given set T . In this paper we determine the all general solutions of this equation. S. Prešić ([6]) introduced the most general concept of equations. Namely, he considered the equation of the form r(x) = 1, where r was a unary relation of a non–empty set S. He gave the ...

OBJECTIVE To obtain pertinent information from individuals who have either experienced cross-border reproductive care, or have considered doing so. DESIGN International online survey of patients in collaboration with patient support groups in Australia and Canada. RESULT(S) Analysis of data is based on 95 usable responses, of which 28 were from individuals who indicated that they had previo...

OBJECTIVE To evaluate the association between female cystic fibrosis (CF) carrier status and in vitro fertilization (IVF) response and outcomes. The presence of cystic fibrosis transmembrane conductance regulator (CFTR) gene mutations in male carriers has been associated with infertility, yet possible adverse effects on the ovarian function and reproductive outcomes of female carriers have not ...