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.
Results
Showing 1 to 20 of 53 for “"inbreeding depression"”.
-
Gene Effects on Inbreeding Depression in Autotetraploid Maize
Made available in DSpace on 2014-12-12T00:17:48Z (GMT). No. of bitstreams: 1 7212353.pdf: 2520582 bytes, checksum: f8040428caea0f325b453513a20edd35 (MD5) Previous issue date: 1971
-
Inbreeding Depression in the Partially Selfing Perennial, Ruellia Humilis
… field population. No evidence was found for inbreeding depression in seedling establishment or survivorship. However, among 502 established seedlings, mean biomass accumulation during the first year of growth was 10% lower in selfed offspring than in outcrossed offspring. No maternal effects …
-
Inbreeding Depression and Competition in the square-stemmed monkey-flower (Mimulus ringens)
… with reduced fitness, a phenomenon known as inbreeding depression. The magnitude of inbreeding depression can play an important role in determining the overall fitness, and persistence, of populations, and is often considered one of the key factors driving the evolution of mating systems and …
-
Inbreeding depression and segregation distortion in Chinook salmon: Conservation implications of genetic load
Strong evidence that shows inbreeding in many plants and animals can lead to detrimental effects at the level of the organism as well as the population. Inbreeding and its effects have been the focus of much attention in terms of conservation and captive rearing and breeding programs for many …
-
The contribution of repeat associated small RNAs to genetic variation, hybrid vigor and inbreeding depression in maize
… (mop1). However, both the degree of inbreeding depression and phenotypic variation are greater in F2 and F3 populations derived from the B73xMo17 mop1 hybrids, suggesting that mop1 mitigates the genetic stress of inbreeding and that the silencing of genes and TEs by 24-nt siRNAs may …
-
Causes and consequences of inbreeding in the banded mongoose
Inbreeding and inbreeding depression have been studied since the days of Darwin and yet we are still making important discoveries today. These discoveries can inform conservation practices as inbreeding depression can contribute to population extinction. Inbreeding is also an important subject in …
-
Impact of self-fertilization on fecundity, the timing of first reproduction, and population genetic structure: Is a mate worth the wait?
… exhibit two evolutionary syndromes uniting high inbreeding depression with low levels of selfing, or low inbreeding depression and high levels of selfing. This study tests for inbreeding depression in an apparent self-compatible, hermaphroditic marine nemertean worm, Prosorhochmus americanus. …
-
The Effect of Maternal and Fetal Inbreeding on Dystocia, Calf Survival, Days to First Service and Non-Return Performance in U.S. Dairy Cattle
… in dairy population. In the current study, inbreeding depression was estimated for number of days to first service, summit milk, conception by 70 days non-return, and calving rate with a linear mixed model (LMM) approach and for calving difficulty, calf mortality with a Bayesian threshold …
-
Evolution of gynodioecy and dioecy: theoretical issues and the case of Bidens sandvicensis and B. cervicata
… and 0.71. In Bidens sandvicensis, significant inbreeding depression occurs in seed set (0.2 to0.5), germination (0.40), first-year survivorship in the field on Kauai (0.42), probability of first-year flowering (0.58) and number of heads produced per flowering plant (0.68). Total inbreeding …
-
Evidence For Reduced Hawkmoth Pollination in Ruellia Humilis
… that standing heterozygosity has been reduced by inbreeding depression, thus violating an important assumption of the mixed mating model. However, the magnitude of inbreeding depression necessary to explain the results is much greater than values reported for other primarily selfing, herbaceous …
-
Evaluation of anther-derived, inbred, and hybrid populations of Streptocarpus X hybridus Voss
The potential of inbreeding and selective hybridization, along with anther culture, for increasing homogeneity with 2 early flowering cultivars of Streptocarpus X hybridus was examined. A 'Concorde' and 'Mixed Nymph' genotype expressed inbreeding depression within 2 generations, characterized by a …
-
Genetics Analysis of Standing Variation for Floral Morphology and Fitness Components in a Natural Population of Mimulus Guttatus (Common Monkeyflower)
… guttatus in the Oregon Cascades. Extensive inbreeding depression has been documented in this population for fertility and viability (Willis 1999 a,b), while previous biometric experiments have demonstrated that some of the floral variation in this site is due to common alleles perhaps …
-
Resource competition and soft selection in Sabatia angularis
… via asymmetric competition in the context of inbreeding depression and its population level consequences. As a mixed-mating species with intermediate selfing rates in wild populations and inbreeding depression, S. angularis provides an ideal system to test soft selection. Selfed individuals …
-
Evolutionary dynamics of mating systems in populations of North American Arabidopsis lyrata
… can vary in their mating systems from completely inbreeding to completely outcrossing, with intermediate forms referred to as mixed mating systems. Arabidopsis lyrata is a strongly outcrossing perennial due to a sporophytic self incompatibility (SI) system. The species occurs in temperate regions …
-
Genetic Dissection of Anthropogenic Impacts on a Declining Antarctic Fur Seal Population
… face is that they are more susceptible to inbreeding which in turn can reduce fitness, a phenomenon known as inbreeding depression. Inbreeding depression affects numerous key fitness traits in captive populations. However, due to the difficulty of studying inbreeding in the wild, many …
-
Drivers of reproductive variability in Vaccinium cespitosum and vaccinium vitis-idaea in northeastern Minnesota
… via geitonogamy and subsequent early-acting inbreeding depression increases. Potential impacts due to early acting inbreeding depression include reduced fruit production and reduced fecundity of populations, which reduces the efficacy of land management. I established multiple survey sites …
-
Effects of Inbreeding on Endangered Red Wolves (Canis rufus)
Inbreeding depression, the reduction in offspring fitness caused by mating among close relatives, is widespread in small populations and a major concern in conservation biology because it can affect population persistence. The negative effects of inbreeding results in the evolution of inbreeding …
-
The evolution of self-compatibility and its genetic consequences in Leavenworthia alabamica (Brassicaceae)
… alleles in populations?; 2) does inbreeding depression selectively maintain self-incompatibility in nature, and if so, what happens to these deleterious alleles following the transition to self-compatibility?; and 3) does a history of self-fertilization cause populations to …
-
Characterizing Deleterious Genomic Mutations in The Presence of Overdominance (a Computer Simulation Approach)
… the labor- and time-consuming M-A approach, the inbreeding depression approach and the fitness moments approach, have been developed recently. Applying these two approaches is hampered because both depend on the assumption that the standing genetic variation in natural populations is solely due …
Page 1 of 3