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Adaptation

N5 Adaptation,Mutation and Natural Selection

TermDefinition
Mutation A change in an organisms DNA (genetic information) which causes a change in the organisms appearance or behaviour.
Neutral Mutations A change in an organisms genetic information that has no effect on the chances of an organism surviving.
Advantageous Mutations A change in genetic information that changes the organisms appearance or behaviour in a way that will increase the chances of an organism surviving.
Disadvantageous Mutations A change in genetic information that changes the organisms appearance or behaviour in a way that will decrease the chances of an organism surviving.
Mutagen/ Mutagenic agent A chemical or physical phenomenom that increases the chances of a mutation occuring.
Examples of Mutagens/ Mutagenic agents include: Certain types of Radiaton, Chemicals and High Temperatures
Adaptation The process in which changes in a populations make them better suited to surviving in there environment.
Structural Adaptation The process in which changes in a population's physical appearance makes them better suited to surviving in there environment.
Behavioural Adaptation The process in which changes in the way a populations acts or reacts makes them better suited to surviving in there environment.
Evolution The continual changes in a species appearance or behaviour over time.
Species Organisms that can interbreed to produce fertile offspring.
Natural Selection The process in which organisms which are better suited to their environment live longer and so are more likely to reproduce to pass on their favourable genetic information/characteristics to their offspring.
Selection Pressure A factor within the environment which will act on a population to decrease its numbers.
Selective Advantage An organisms characteristics or behaviours that enable it to survive and reproduce better than other organisms in a population within a particular environment.
Speciation The process by which new species are formed.
Isolation Barrier Any factor that prevents a group of individuals being able to reproduce with another group of individuals within the same population.
Examples of Isolation Barriers •Geographical - physical structures such as mountains,oceans, deserts •Ecological - differences in factors such as light intensity, pH, water availability •Reproductive - Changes in the reproductive organs, changes in when the organism mates.
Examples of Selection Pressures •competition •predation •disease •parasitism •habitat loss •environmental changes •pollution
Gene Pool All of the genes available to the members within a population.
Created by: dhsbiology