Life Sciences Commons^™

The Detection Of Putative Recessive Lethal Haplotypes In Irish Sheep Populations, Rory Mcauley

ORBioM (Open Research BioSciences Meeting)

In livestock populations, recessive lethal alleles are a known contributor to poor reproductive performance due to embryonic death in homozygous individuals. Despite their lethal effect in the recessive form, these alleles may be maintained at high frequencies among carrier animals because of their positive pleiotropic effects on economically important traits. Although several such recessive alleles have been identified in cattle and pig populations, limited studies have been completed in sheep, and none within Irish sheep populations. Genotype data for 69,034 animals from five major Irish sheep breeds genotyped on a variety of panels was available for this study. Only animals …

Development And Genetic Analysis Of A Mapping Population On Medicago Truncatula, Zhenwu Wei, Zhanhua Yang, Lifang Zhang

IGC Proceedings (1997-2023)

No abstract provided.

Genetic Analysis Of Some Morphological Traits In Egyptian Clover (Trifolium Alexandrinum L.), Tejveer Singh, D. R. Malaviya, P. Kaushal

IGC Proceedings (1997-2023)

Trifolium alexandrinum, commonly known as Berseem or Egyptian clover (2n=2x=16) is an important winter forage legume in India, Pakistan, Turkey, Egypt and Mediterranean region. It is characterized by three ecotypes viz; Mescavi, Fahli and Saidi. Amongst these, Mescavi type is most popular. In India it is cultivated in about 2 million hectare area.

The major impediment in genetic improvement of berseem is the lack of appreciable genetic variability (Verma and Mishra, 1995; Roy et al., 2004; Malaviya et al., 2005). Although limited, variability for desirable traits at intraspecific (T. alexandrinum var Fahli and var Saidi) …

Baseline Microbial Characterizations Of An Imperiled Aquatic Diversity Hotspot: Ash Meadows National Wildlife Refuge, Jessica Newburn, Jim Bruckner, Jenny C. Fisher, Duane P. Moser

Undergraduate Research Opportunities Program (UROP)

Located in the discharge zone of the Death Valley Flow System, Ash Meadows National Wildlife Refuge is a spring-fed desert oasis and biodiversity hotspot about 90 miles northwest of Las Vegas. These critical wetlands are potentially threatened by groundwater pumping, exotic species invasions, and climate change. Although a major component of the lower food web, very little is known about the microbial makeup of this ecosystem. As a first step towards understanding the microbial and biogeochemical aspects of this system, a detailed molecular-based characterization of microbial communities, baseline chemistry, and physical characteristics of various springs of Ash Meadows will be …

Genomic Foundations Of Carbon Fixation In Bacteria Living In Hot Springs, Rachel K. Skinner, Brian P. Hedlund, Jeremy A. Dodsworth

Undergraduate Research Opportunities Program (UROP)

Photosynthesis does not occur above 73°C, so organisms living above this temperature must obtain useable carbon by some other mechanism. It is generally assumed that carbon is fixed by thermophiles through the process of chemolithoautotrophy; however, primary production has never been demonstrated to occur in hot springs >73°C. We have shown that two organisms, Thermocrinis and Pyrobaculum, make up more than 90% of the cells in an 80°C Great Basin hot spring, Great Boiling Spring. We hypothesize that these organisms fix carbon in the hot spring via the reverse tricarboxylic acid (rTCA) cycle. To test this hypothesis we will: i) …