Variation is the differences that can be seen in the phenotype of individuals.
Every individual has a phenotype which depends on that individuals genotype which can be influenced by that particular persons living environment.
Variation in a population are the differences in the phenotypes of each individual, this is caused by variation in the species genotype and changes in the environment they live in.
1) Variation caused by genes (discontinueos)
2) A combination of variation caused by genes and environment ( continueos)
3) Variation caused by environment
The third type of variation in population can be purely to do with environmental variation and has nothing to do with genetic charateristics, an example of this is the home language that an individual speaks. This cannot be inherited.
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