Matching Items (3)
Filtering by
- All Subjects: Adolescence
- Genre: Academic theses
- Creators: Bradley, Robert
- Member of: ASU Electronic Theses and Dissertations
- Resource Type: Text
Description
During adolescence, friends are a central part of adolescents' daily lives, they serve as significant sources of emotional support and companionship (Keefe & Berndt, 1996; Way & Robinson, 2003) as well as provide opportunities to negotiate interpersonal conflicts and disagreements (Laursen & Pursell, 2009). This study was designed to examine the nature and correlates of friendships, capturing the multidimensional nature of these relationships. Specifically, three goals were proposed: (a) to use a pattern-analytic approach to identify different profiles of adolescents' friendships along three dimensions: intimacy, negativity, and involvement; (b) to examine linkages between profile membership and adolescents' cultural orientations and values; and (c) to explore the relation between profile membership and adolescent well-being. Participants were 246 Mexican-origin adolescents (M = 12.50 years; SD = 0.58) who participated in home interviews and a series of nightly phone calls. Adolescents reported on their friendship qualities, their cultural orientations and values, as well as their depressive symptoms, risky behaviors, and on their current grades (GPA). Adolescents' time spent with best friends was calculated from the seven nightly phone calls. Results revealed three distinct latent profiles: Positive Engagement, Moderate Engagement, and Low Involvement. Profile membership was not linked to adolescents' cultural orientations and values. Further, associations emerged between profile membership and adolescents' GPA, but not their risky behaviors and depressive symptoms.
ContributorsRodriguez, Sue Annie (Author) / Updegraff, Kimberly (Thesis advisor) / Umana-Taylor, Adriana (Committee member) / Bradley, Robert (Committee member) / Arizona State University (Publisher)
Created2011
Description
In species with highly heteromorphic sex chromosomes, the degradation of one of the sex chromosomes can result in unequal gene expression between the sexes (e.g., between XX females and XY males) and between the sex chromosomes and the autosomes. Dosage compensation is a process whereby genes on the sex chromosomes achieve equal gene expression which prevents deleterious side effects from having too much or too little expression of genes on sex chromsomes. The green anole is part of a group of species that recently underwent an adaptive radiation. The green anole has XX/XY sex determination, but the content of the X chromosome and its evolution have not been described. Given its status as a model species, better understanding the green anole genome could reveal insights into other species. Genomic analyses are crucial for a comprehensive picture of sex chromosome differentiation and dosage compensation, in addition to understanding speciation.
In order to address this, multiple comparative genomics and bioinformatics analyses were conducted to elucidate patterns of evolution in the green anole and across multiple anole species. Comparative genomics analyses were used to infer additional X-linked loci in the green anole, RNAseq data from male and female samples were anayzed to quantify patterns of sex-biased gene expression across the genome, and the extent of dosage compensation on the anole X chromosome was characterized, providing evidence that the sex chromosomes in the green anole are dosage compensated.
In addition, X-linked genes have a lower ratio of nonsynonymous to synonymous substitution rates than the autosomes when compared to other Anolis species, and pairwise rates of evolution in genes across the anole genome were analyzed. To conduct this analysis a new pipeline was created for filtering alignments and performing batch calculations for whole genome coding sequences. This pipeline has been made publicly available.
In order to address this, multiple comparative genomics and bioinformatics analyses were conducted to elucidate patterns of evolution in the green anole and across multiple anole species. Comparative genomics analyses were used to infer additional X-linked loci in the green anole, RNAseq data from male and female samples were anayzed to quantify patterns of sex-biased gene expression across the genome, and the extent of dosage compensation on the anole X chromosome was characterized, providing evidence that the sex chromosomes in the green anole are dosage compensated.
In addition, X-linked genes have a lower ratio of nonsynonymous to synonymous substitution rates than the autosomes when compared to other Anolis species, and pairwise rates of evolution in genes across the anole genome were analyzed. To conduct this analysis a new pipeline was created for filtering alignments and performing batch calculations for whole genome coding sequences. This pipeline has been made publicly available.
ContributorsRupp, Shawn Michael (Author) / Wilson Sayres, Melissa A (Thesis advisor) / Kusumi, Kenro (Committee member) / DeNardo, Dale (Committee member) / Arizona State University (Publisher)
Created2016
Description
Sibling relationships are important units of socialization during adolescence. These involuntary relationships consist of positive and negative relationship qualities (Buist & Vermande, 2014; Deater-Deckard et al., 2002; Updegraff et al., 2005a), and some dimensions of these relationships are less understood than other dimensions. One dimension in need of attention is that of sibling relational victimization, which includes behaviors aimed at harming one’s sibling relationship during a period in which interpersonal relationships are developmentally salient (Collins & Steinberg, 2006; Crick, 1995; Crick & Grotpeter, 1995). In my dissertation, I examine the associations between family and friendship dynamics and sibling relational victimization longitudinally during adolescence. In study 1, I examined the developmental change in sibling relational victimization experiences during adolescence, and tested the associations between parent-youth and sibling conflict and intimacy and sibling relational victimization longitudinally. Sibling structural characteristics were explored as moderators. Using longitudinal growth and multi-level modeling, I found that sibling relational victimization decreased across adolescence for both siblings, with younger siblings reporting higher frequency of sibling relational victimization relative to older siblings. On a general level, parent-adolescent and sibling intimacy and conflict were associated with sibling relational victimization, albeit in different ways for mixed- and same-gender dyads and older and younger siblings. Overall, findings from study 1 highlight the importance of examining parent-youth and sibling relationship dynamics, the vulnerability of younger siblings as victims of sibling relational victimization, and the interplay of sibling gender dynamics and father-youth relationships on sibling relational victimization experiences in adolescence.
In study 2, I examined whether sibling relational victimization and negativity moderate the associations between parent-adolescent conflict and friendship control, conflict, and perspective taking in adolescence. Variation by sibling birth order and gender also was explored. Using path analytic models, I found that mother-adolescent, sibling, and friendship dynamics were interlinked, such that mother-adolescent conflict in combination with sibling negativity and sibling relational aggression were associated with friendship outcomes, albeit differently by sibling gender and friendship outcome. Findings from study 2 suggest the importance of addressing negative mother-adolescent and sibling relationship dynamics in prevention and intervention curricula aimed at promoting positive friendship dynamics during adolescence.
ContributorsSarama, Annabella Gallagher (Author) / Updegraff, Kimberly (Thesis advisor) / Kochenderfer-Ladd, Becky (Committee member) / Thompson, Marilyn (Committee member) / Bradley, Robert (Committee member) / Arizona State University (Publisher)
Created2021