EEB202H1 Lecture Notes - Lecture 2: Inbreeding, Coefficient Of Relationship, Eichhornia Crassipes
3 Oct 2016
School
Department
Course
Professor
Document Summary
Distinctive features of flowering plants influencing their reproduction. Sexual reproduction passive process cross-pollination leads to new combo of genes in offspring and increases likelihood of adaptation relies on external agents to transfer pollen from stamen(m) to pistil(f) Pollination systems animal pollination most common 60-65% mutualism (when both partners benefit) plants - cross-pollinated animals - resources e. g. nectar. Graph: inbreeding decreases yield in maize linear relationship b/t avg yield of corn and inbreeding coefficient (0=absolute outbreeding; 1=highly inbred=high level of homozygosity) evolution of self-pollination if pollination by animals is not possible -> selfing adaptations. Darwin: reproductive assurance hypothesis aka at least you reproduce selfing often produces genetically inferior offspring. 50% of plant species have a mechanism to prevent selfing - self-incompatibility physiological incompatibility - mechanism for stoping selfing another mechanism = separating male and female function in time file:///users/user/desktop/eeb202/lec2. html. His research: flowers of outcrossing & selfing pop. of eichhornia paniculata. Water hyacinth - both sexual and clonal reproduction.
