Fluctuating Asymmetry
Mostrando 25-30 de 30 artigos, teses e dissertações.
-
25. Temperature shock during development fails to increase the fluctuating asymmetry of a sexual trait in stalk-eyed flies.
The fluctuating asymmetry (FA) of bilateral traits is claimed to be a general indicator of environmental stress. Exaggerated sexual ornaments are thought to show elevated levels of FA and a greater response to stress than other traits. Previous work with stalk-eyed flies (Cyrtodiopsis dalmanni) has shown that the FA of the sexual trait (male eye stalks), win
-
26. Allozyme-Associated Heterosis in Drosophila Melanogaster
Two large experiments designed to detect allozyme-associated heterosis for growth rate in Drosophila melanogaster were performed. Heterosis associated with allozyme genotypes may be explained either by functional overdominance at the allozyme loci, or closely linked loci; or by genotypic correlations between allozyme loci and loci at which deleterious recess
-
27. Adaptive significance of differences in the tissue-specific expression of a phosphoglucomutase gene in rainbow trout.
We have investigated the phenotypic effects of a mutant allele that results in the expression of a phosphoglucomutase locus (Pgm1) in the liver of rainbow trout. Embryos with liver Pgm1 expression hatch earlier than embryos without liver Pgm1 expression. These differences apparently result from increased flux through glycolysis in embryos with liver PGM1 act
-
28. A latent variable model of developmental instability in relation to men's sexual behaviour.
A single trait's fluctuating asymmetry (FA) is expected to be a poor measure of developmental instability. Hence, studies that examine associations between FA and outcomes expected to covary with developmental instability often have little power in detecting meaningful relationships. One way of increasing the power of detecting relationships between developm
-
29. The Expression of Additive and Nonadditive Genetic Variation under Stress
Experimental lines of Drosophila melanogaster derived from a natural population, which had been isolated in the laboratory for ~70 generations, were crossed to determine if the expression of additive, dominance and epistatic genetic variation in development time and viability was associated with the environment. No association was found between the level of
-
30. Paired-pulse depression of unitary quantal amplitude at single hippocampal synapses
At central synapses, quantal size is generally regarded as fluctuating around a fixed mean with little change during short-term synaptic plasticity. We evoked quantal release by brief electric stimulation at single synapses visualized with FM 1–43 dye in hippocampal cultures. The majority of quantal events evoked at single synapses were monovesicular, base
National Academy of Sciences.