There is variation in a population, some variation is inherited
Reproduction results in many offspring, most of these do not survive
Occasionally there is a new variation, a mutation in the DNA
Only the fittest survive and reproduce, genes are passed on
Gradually a species can change and a new species will arise
New species will occur when two populations are separated
Variation - there is a genetic variation in a population
Mutation - random, the source of a new variation
Survival - of the fittest
Reproduction - the survivors pass on their genes
Alleles - forms of a gene for fitness that are passed on
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