Title of Document: REPRODUCTIVE ISOLATION AND X CHROMOSOME MEIOTIC DRIVE IN CYRTODIOPSIS STALK-EYED FLIES. Sarah J. Christianson, Doctor of Philosophy, 2008 Directed By: Professor Gerald Wilkinson, Department of Biology Haldane’s rule states that when one sex of hybrids shows sterility or inviability it tends to be the heterogametic sex. This pattern is considered a fundamental law of speciatio...

The evolution of microstructure and mechanical properties of almost fully amorphous Mg(72) Zn(23) Ca(5) and crystalline Mg(70) Zn(23) Ca(5) Pd(2) alloys during immersion in Hank's balanced salt solution (HBSS), as well as their cytocompatibility, are investigated in order to assess the feasibility of both materials as biodegradable implants. Though the crystalline Mg(70) Zn(23) Ca(5) Pd(2) samp...

High levels of female and male sterility were observed among the hybrids from one of the two reciprocal crosses between a wild strain of D. melanogaster known as pi2 and laboratory strains. The sterility, which is part of a common syndrome called hybrid dysgenesis, was found to be associated with the rudimentary condition of one or both of the ovaries or testes. All other tissues, including tho...

We analyzed the genetic basis of postzygotic isolation between the Bogota and USA subspecies of Drosophila pseudoobscura. These subspecies diverged very recently (perhaps as recently as 155,000 to 230,000 years ago) and are partially reproductively isolated: Bogota and USA show very little prezygotic isolation but form sterile F1 males in one direction of the hybridization. We dissected the bas...

Hybrid sterility hinders the transfer of useful traits between Oryza sativa and O. glaberrima. In order to further understand the nature of interspecific hybrid sterility between these two species, a strategy of multi-donors was used to elucidate the range of interspecific hybrid sterility in this study. Fifty-nine accessions of O. glaberrima were used as female parents for hybridization with j...

Abstract Anastrepha fraterculus (Wiedemann, 1830) (Diptera: Tephritidae) is a major fruit pest, which basicaly controlled using insecticides, represents risk to beneficial arthropods, human health and food contamination. The sterile insect technique (SIT) potential alternative tool for the management of this however, only conflicting data found regarding optimal dose achieve sterility. Thus, st...

The recessive genetic male sterility (RGMS) system plays a key role in the production of hybrid varieties in self-pollinating B. napus plants, and prevents negative cytoplasmic effects. However, the complete molecular mechanism of the male sterility during male-gametogenesis in RGMS remains to be determined. To identify transcriptomic changes that occur during the transition to male sterility i...

This paper discusses old usages and beliefs about sterility in Colonial Brazil. Treated as a curse usually befallen women, sterility was struggled with symbolism and phytotherapy, aiming to "unbock" or "remove the spell" from the craddle of creation.

A decrease in the tiller number and male sterility will lead to a decline rice yield. Therefore, it is significant study molecular mechanism of controlling regulating reproductive development. The mutant st2 (single 2) was induced by ethyl methane sulfonate (EMS) indica maintainer line Xinong 1B showed single tillering sterility. I2-KI staining that pollen aborted. scanning electron microscope ...