Effects of Human Activities & Sustainability
- Created by: beth-marie2511
- Created on: 19-06-16 14:50
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- Effects of Human Activity & Sustainability
- Resistance in Rats
- Warfarin poison has been over used to kill rats and many have developed a resistance to it
- Resistance has occurred through mutation
- Increased use of warfarin has increased the rate of mutation within rats
- R = resistant to warfarin and has vitamin K
- Homozygous recessive rat = rr
- Not resistant to warfarin but has vitamin K so will be killed by warfarin
- Heterozygous rat = Rr
- Resistant to warfarin but require more vitamin K so will likely die to a shortage of vitamin K
- Homozygous dominant rat = RR
- Resistant to warfarin and requires even more vitamin K so is most likely to die of vitamin K shortage / deficiency
- Homozygous recessive rat = rr
- r = not resistant to warfarin and has vitamin K
- Antibiotic Resistance
- Has been caused by the over use/ over prescription in farming
- Resulted in an increased rate of mutation
- Bacteria have developed an advantageous allele that makes them resistant to antibiotics
- E.G. MRSA
- Has been caused by the over use/ over prescription in farming
- Artificial Selection
- E.G. Dog breeding
- Carried out by humans to obtain plants or animals with desired characteristics
- Takes many years to develop organisms with desired characteristics
- Organisms of the same species are produced but they are described s different breeds
- Inbreeding occurs when the gametes that fuse are from close relatives
- Causes health problems
- Outbreeding occurs when unrelated varieties are crossed together
- Resistance in Rats
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