AQA Biology Unit 2: 9 Genetic Diversity 4.0 / 5 based on 2 ratings ? BiologyDNA, genetics and evolutionASAQA Created by: Beth EvansCreated on: 20-03-13 08:14 Diversity Similarities and differences between organisms can be defined in terms of variation of DNA DNA difference leads to genetic diversity Selective Breeding Also known as artificial selection It uses the desired characteristics from one animal Offspring are produced with the desired characteristic If the offspring doesn't have the characteristic it can be killed or stopped from breeding Alleles for unwanted characteristics are bred out Selective breeding reduces genetic diversity It is carried out to produce high yield plants or animals 1 of 2 Diversity Cont The Founder Effect When few individuals from a population colonise a new region The individuals have few alleles When the colony repopulate they have less genetic diversity In time the population may develop into a separate species They are less adapt to changing conditions since they have fewer alleles Genetic Bottleneck Natural disasters can cause this The survivors will possess smaller variety of alleles then original population When repopulating the genetic diversity will remain restricted The fewer alleles mean they are less adapt to change in conditions 2 of 2
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