Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"assortative mating"”.
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Selection and Assortative Mating
Theoretical aspects of selection and assortative mating were considered separately and jointly. Selection based on the conditional mean of the merit variable given the data maximizes the expected value of the merit variable when the proportion selected is constant. This is optimal even if …
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Diet, adaptation and the evolution of assortative mating in Ceratitis capitata
… isolation was also explored, through further mating tests, and also the quantification of male courtship behaviour. The genetic basis of the phenotypes associated with adaptation and sexual isolation was explored using transcriptomic sequencing and differential expression analysis of genes …
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Response to Selection for Pupal Weight With and Without Assortative Mating in Tribolium Castaneum
Joint effects of pre-selection mating system (random: R; assortative: A), selection mating system (R;A) and percent truncation selected (20%; 50%; 0% (control)) were studied in a 2 x 2 x 3 factorial experiment with 5 replicates to examine direct response to selection for pupal weight (PW), and …
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Assortative mating among men and women with histories of aggressive, withdrawn, and aggressive-withdrawn behaviour
… and withdrawal. The principal question of assortative mating was investigated within a longitudinal, community-based sample of men and women with histories of aggressive and/or withdrawn childhood behaviour. Using peer nominations, 1,770 boys and girls were originally identified at ages 7, …
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Assortative Mating in <em>Ixodes Scapularis</em> (Acari: Ixodidae) Ticks? And <em>Ixodes Scapularis</em> Infest Male Deer More Often Than Female Deer at Savannah River Site, (Aiken, SC)
… Southeastern United States is maintained through assortative mating. The study of 319 couples of ticks collected in copula from deer at the Savannah River Site (Aiken, SC) showed that ticks assigned to mitochondrial (12SrDNA and d-loop genes) phylogenetic monophyletic clades do not chose their …
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Panmixia Across the Range of the Assortatively Mating Lesser Snow Goose
… has been shown to exhibit imprinted positive assortative mating on the basis of its color phases, blue and white, and it has been proposed that the geographic cline of the color phases reflects a historic allopatry of the phases. Using ddRAD-seq, thousands of SNPs were analyzed in both phases …
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Use of a translocation and a recessive deleterious gene to retard population growth in Blattella germanica (L.)
… including fecundity, competitiveness and assortative mating. Linkage between T(8;9) and sty was also measured. The translocation T(8;9) and sty were successfully introduced into the experimental populations by the introduction of heterozygous males. Experimental populations were only 50% …
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An Assessment of the Effects of Sexual Selection and the Social Environment on Mating Behaviors in Two Tiger Beetle Species (Coleoptera: cicindelidae)
… results due to sperm competition. Facultative mating behaviors are predicted to occur in these taxa when changes in the social environment alter the benefits for guarding males. I used field observations and lab experiments in 2006 and 2007 to investigate the factors influencing mating …
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Phylogeography and ecology of New Zealand freshwater Amphipoda (Paracalliope, Paraleptamphopus, and Phreatogammarus)
… a combined field and laboratory approach, size assortative mating was examined in Paracalliope fluviatilis. The field study showed positive size assortative mating and that larger females carried more eggs, suggesting they were more fecund. A series of laboratory experiments examining four …
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Three Essays on Compensation
… will work. However, after netting out the likely assortative mating bias, I find that wives with spousal coverage are more likely to work part-time (and less likely to work full-time).
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Foraging ecology, sexual selection, and divergence in sunfish (Lepomis spp.)
… variation among reproductive groups may increase mating success, indicating that sexual selection may be an important factor in the phenotypic diversification of bluegill. I next examined the relationship between stable isotopes (δ13C and δ15N) in different female tissues (white muscle, liver, and …
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Spousal Concordance in Academic Achievements and Intelligence and Family-Based Association Studies Identified Novel Loci Associated with Intelligence.
<p>Assortative Mating, the tendency for mate selection to occur on the basis of similar traits, plays an essential role in understanding the genetic variation on academic achievements and intelligence (IQ). It is an important mechanism explaining spousal concordance. We used principal component …
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The added worker effect in South Africa
… religious and ethnic backgrounds (known as assortative mating) which masks the addWE. This approach is thus shown to be inappropriate for the analysis of the addWE.
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Married Women's Employment and Family Income Inequality
… But, despite the presence of positive assortative mating between Malaysian couples, the relatively high inequality of wives' earnings and the positive correlation between spouses' earnings, the data suggest that married women's earnings equalize family income inequality both in 1979 and …
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The role of a circalunar clock in speciation
… previously assumed. Phenotypes influencing both mating and ecology (magic traits) lie at the center of many simple models of sympatric speciation and may play important roles in empirical systems. However, few examples have been fully studied in terms of ecology, reproductive isolation, and …
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Speciation dynamics of an agent-based evolution model in phenotype space
… is shown to occur for populations reproducing by assortative mating and asexual fission. Furthermore, mutability is also shown to change the clustering behavior of populations. Random mating is shown to destroy both phase transition behavior and clustering. The phase transition behavior is …
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Applying ancestry tracts to human genetics: disentangling admixture history and characterizing gene conversion
… Americans and discover strong patterns of assortative mating by ancestry proportion: couples' ancestry proportions are highly correlated ($R=0.87$). Next I introduce a pedigree-based gene-conversion simulator and present an unbiased coalescent estimator for gene-conversion rates based on an …
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Female Ornamentation in the American Robin
… as with ectoparasite load. I found evidence of assortative mating based on crown UV reflectance and bill colour. To assess reproductive investment, I measured egg size, yolk proportion, and deposition of yolk testosterone and carotenoids. Females with brighter (lighter) carotenoid-based bill …
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Aging And The Gains From Marriage
… by their education and race in order to capture assortative mating along these dimensions. The results concerning age do not qualitatively change. I find large differences in marital output based on college attainment, but not race.
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The role of cultural divergence in reproductive isolation in a tropical bird, the rufous-collared sparrow (Zonotrichia capensis)
… response to all conspecific dialects. Premating reproductive isolation based on culture may exist among the study populations. In chapter III, I investigated if cultural divergence can drive population divergence by examining dialects and variable microsatellite loci among eight …
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