Genetic Diversity - Chapter 9 AQA AS Biology
- Created by: H.N
- Created on: 15-11-12 20:02
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- Genetic Diversity
- more alleles
- could occur due to mutations in the DNA
- gene flow - migration of organisms
- can adapt to environment better
- more genetic diversity
- selective breeding/artificial selection
- individuals with desired characteristics selected for next generation
- unwanted alleles bred out of population
- usually to produce high-yielding breeds
- For
- high-yields of animals/plants
- species with increased resistance to disease
- fewer drugs/pesticides for farmers
- bred to have increased tolerance to bad conditions
- Against
- health problems for animals
- reduced genetic diversity
- increased genetic disease
- increased susceptibility to new diseases due to lack of alleles
- The founder effect
- few individuals colonise a new rehion
- few alleles - may not represent whole population
- less alleles to adapt to environment
- less genetic diversity than previous population
- more inbreeding - higher incidence of genetic disease
- Genetic bottlenecks
- dramatic drop in numbers in a population
- due to chance event or human interference
- few survivors, few alleles in gene pool
- genetic diversity restricted as they re-establish
- more alleles
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