Open Access. Powered by Scholars. Published by Universities.®
- Institution
- Publication
- Publication Type
Articles 1 - 6 of 6
Full-Text Articles in Life Sciences
Genetic Circadian Mosaics And The Clock Network’S Contributions To Sleep, Lukasz Widziszewski
Genetic Circadian Mosaics And The Clock Network’S Contributions To Sleep, Lukasz Widziszewski
Dissertations, Theses, and Capstone Projects
Circadian rhythms are physiological and behavioral changes which follow a 24-hour cycle. Drosophila Melanogaster’s circadian clock neuronal network (CCNN) has been identified and several subpopulations have been characterized based on previous studies; the classifications of subpopulations of neurons within the CCNN are based on a return of anticipatory locomotor activity preceding the two daily light transitions (Lights on = dawn/Lights off = dusk). The neurons responsible for the return of anticipatory morning locomotor activity have been referred to as the M-cells, the group of neurons known to rescue evening anticipatory locomotor activity have been termed the E-cells. In this …
Testing The Drosophila Maternal Haploid Gene For Functional Divergence And A Role In Hybrid Incompatibility, Dean M. Castillo, Benjamin Mccormick, Connor M. Kean, Sahana Natesan, Daniel A. Barbash
Testing The Drosophila Maternal Haploid Gene For Functional Divergence And A Role In Hybrid Incompatibility, Dean M. Castillo, Benjamin Mccormick, Connor M. Kean, Sahana Natesan, Daniel A. Barbash
Nebraska Extension: Faculty and Staff Publications
Crosses between Drosophila simulans females and Drosophila melanogaster males produce viable F1 sons and poorly viable F1 daughters. Unlike most hybrid incompatibilities, this hybrid incompatibility violates Haldane’s rule, the observation that incompatibilities preferentially affect the heterogametic sex. Furthermore, it has a different genetic basis than hybrid lethality in the reciprocal cross, with the causal allele in Drosophila melanogaster being a large species-specific block of complex satellite DNA on its X chromosome known as the 359-bp satellite, rather than a protein-coding locus. The causal allele(s) in Drosophila simulans are unknown but likely involve maternally expressed genes or factors since the F1 …
Characterizing Mekk1: Candidate Behavioural Isolation Gene, Caryn Dooner
Characterizing Mekk1: Candidate Behavioural Isolation Gene, Caryn Dooner
Electronic Thesis and Dissertation Repository
Behavioural isolation can occur due to divergence in aspects of courtship and mating, and can contribute to reproductive isolation. The purpose of this study is to determine how a gene, Mekk1, contributes to female rejection behaviour between D. melanogaster and D. simulans. Unique polymorphisms were identified within D. simulans Mekk1 that could contribute to behaviour, most of which are non-coding. Both transcripts of Mekk1 appear to be expressed at similar levels in D. simulans and D. melanogaster. These data also indicate that Mekk1 may be expressed in a specific region of the brain called the mushroom body, …
Octopamine In Sexual Behavior, Ana Isabel Fernandez
Octopamine In Sexual Behavior, Ana Isabel Fernandez
Open Access Theses & Dissertations
Octopamine is a biogenic amine neuromodulator present in neuronal and non-neuronal tissues in invertebrates (Roeder, 1999). It modulates numerous physiological processes such as motivation, pheromone response, olfaction, ovulation, learning and memory. Octopamine together with its precursor tyramine have roles restricted only to invertebrates (Roeder, 1999). It is believed that octopamine is the invertebrate homolog of norepinephrine, a catecholamine present in mammals that acts as a neuromodulator in the sympathetic and central nervous systems. Both octopamine and norepinephrine are derived from the same amino acid tyrosine and are monoamine neurotransmitters. The main objective of this study is to understand the role …
Effect Of Maternal Age On Offspring Social Behaviour In Drosophila Melanogaster, Shirley Long
Effect Of Maternal Age On Offspring Social Behaviour In Drosophila Melanogaster, Shirley Long
2016 Undergraduate Awards
Aging can be defined as the natural and progressive decline in physiological functioning leading to increased risk for disease and death. Although the effects of age are well characterised, much less work has been done to study whether these detrimental changes can be transmitted to offspring. Advanced parental age has been correlated with higher incidence of neuropsychiatric disorders such as autism in children. As average maternal age increases in North America, it is becoming increasingly relevant to study the effects of maternal and paternal age on offspring social behaviour. We hypothesize that advanced maternal age in Drosophila melanogaster will affect …
Consequences Of Developmental Lead (Pb2+) Exposure On Reproductive Strategies In Drosophila, Elizabeth Kathleen Peterson
Consequences Of Developmental Lead (Pb2+) Exposure On Reproductive Strategies In Drosophila, Elizabeth Kathleen Peterson
Legacy Theses & Dissertations (2009 - 2024)
Anthropogenic lead (Pb) pollution is ubiquitous in the environment and a risk factor for both human and wildlife health. Pb exposure has the potential to alter reproductive strategies with respect to mate choice and reproductive output. This could be especially deleterious if these changes disrupt adaptive behavioral and reproductive life history strategies. Therefore, the overall aim of this body of work was to examine the consequences of developmental Pb exposure on reproductive strategies, using Drosophila melanogaster as a model system. In all experiments, D. melanogaster were reared from egg stage to adulthood in either control or leaded medium and were …