ABSTRACT
The fertility component of natural selection acting on chromosomal inversions in two experimental populations of Drosophila pseudoobscura was subdivided into the effects of female fecundity and male mating success. The offspring of the three female genotypes could be distinguished by their mitochondrial DNA haplotypes, thus permitting a direct measurement of the relative fecundities of the female genotype. The effects of male mating success on inversion frequency were measured by comparing inversion frequencies in parents and their offspring. Selection by fertility caused significant changes in inversion frequency in both populations. In one population, the changes in inversion frequency due to female fecundity and to male mating success were comparable. In the other population, however, the changes in inversion frequency due to male mating success were considerably larger than those due to female fecundity. The difference between the two populations underscores the intrinsic variability of the fertility component of fitness.
Subject(s)
DNA, Mitochondrial/genetics , Drosophila/physiology , Selection, Genetic , Animals , Chromosome Inversion , Chromosome Mapping , Drosophila/genetics , Female , Fertility , Genotype , Haplotypes , Male , ReproductionABSTRACT
Professionalism and Unionism are defined and compared. Some reasons for professionals electing to become unionised are suggested. In the context of the relationship of therapists with unions in British Columbia, two examples of labour action are described; how were occupational therapists involved in the issues which resulted in strike situations? What were the conflicts between the professional code of ethics and the union directives? How did individuals resolve these conflicts and what were the consequences? Occupational therapists must decide how they can be accountable to the profession and when that lifelong commitment takes precedence over union loyalties.
