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
- apparatus to measure distribution
- 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
- Inbreeding reduces the range of genes in the population (limited gene pool)
- 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
- monitoring & maintaining the enviroment
- 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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