BIOB38H3 Lecture Notes - Lecture 4: Genetic Erosion, Proposed Los Angeles Nfl Stadiums, Pesticide Resistance
Document Summary
Ecological negative effects of the gr: loss of crop diversity, pesticide resistance, unsustainable soil use, unsustainable water use, unsustainable fossil fuel use. Loss of crop diversity: crop plant diversity 101, genetic erosion and it"s negative effects, measures against genetic erosion. Diversity of verities, cultivars, races: groupings within a single species (red pepper, bred in narrow geographic area through cultivation history, a desirable unit intended to be kept unchanged over time, allelic genetic diversity within varieties or species. Function diversity within varieties: water use efficiency uptake, nutrient use efficiency/uptake, flowering or fruiting time, winter hardiness, pest resistance, yield. Morphological diversity within varieties: fruit color, fruit size, number of flowering organs, height. Past: many different, locally adapted varieties, each contained many different genotypes. Present: fewer varieties, focus on high-yield varieties high genetic uniformity within each variety. Loss of within variation diversity (one farmer"s field) Loss of within and between variety diversity (many farmer"s fields)
