Biology Le6
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Define the term mutation
A mutation is a random change to genetic material
Give two examples of mutagenic agents
Radiation and Chemicals
Varation is importatnt within a species because..
It makes it possible for a population to devolve over time
The stages of natural selection are …
Species produce more offspring than the enviroment can sustain. Natural selection or survival of the fittest occurs whe there are selection pressures.
Mutations can be classed as..
Neutral, Advantage, Disadvantage
The steps of speciation are..
-isolation -Mutation -Natural selection -Reunited with family
Biological definiton of species
A species is a group of organisms that are able to interbreed and produce fertile offspring
Give two types of isolation barrier
Temporal isolation and Ecological isolation
Are mutations spontanious?
yes! and they are the only source for new alleles
What is adaptation
Adaptation is new alleles produced by mutation and can result in plants or animals becoming better adapted to their enviroment
What is natural selection?
Survival of the fittest