B6.1

  • Created by: sofia84
  • Created on: 13-10-18 11:42
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  • B6
    • monitoring & maintaining the enviroment
      • apparatus to measure distribution
        • pooter
        • pitfall trap
        • pond net
        • quadrat
          • measure area of the field, randomly place quadrat, count no of plants in quadrats and work out mean of each.X by no of m^2 in field
        • line transects
      • The capture recapture method
        • 1. count no. of animals caught in trap
        • 2. mark and release them
        • 3. count animals caught a few days later, note how many are/aren't marked
        • population size= (no in 1st sample X no. in 2nd) / no in 2nd marked
      • Biodiversity
        • the variety of living organisms and the ecosystems in which they live
        • Greater biodiversity= more stable ecosystems
        • useful for finding plants for medicine
    • Selective breeding
      • the process of finding plants or animals with desirable characteristic and breeding them together over generations until the characteristics are present in the offspring
      • eg,
        • domestic dogs
        • chicken that produce larger eggs
        • sheep for their quality of wool
      • problems with SB
        • Inbreeding reduces the range of genes in the population (limited gene pool)
          • makes them more prone to genetic diseases & birth defects
      • why do we use wild versions of a cultivated plant in breeding programmes?
        • to make new plant tolerant to diseases
        • wild versions may have genes/ alleles useful for new varieties to have
    • Genetic engineering
      • the alteration of an organism's genome
      • benefits of GM
        • higher crop yields
        • more nutritious
        • more resistant to pests and disease
      • plant breeding programmes
      • risks of GMOs
        • could escape from biotechnology facilities and cannot be brought back
        • viruses of GMOs could reproduce in cells of other organisms & spread disease
        • Bt plants are plants inserted with Bt gene which produces natural insecticide
  • risks of GMOs
    • could escape from biotechnology facilities and cannot be brought back
    • viruses of GMOs could reproduce in cells of other organisms & spread disease
    • Bt plants are plants inserted with Bt gene which produces natural insecticide

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