The differences from the average of the traits as found in various individuals of a species are called variations. What does "average of the traits" mean?I got this definition of variation in a...

The differences from the average of the traits as found in various individuals of a species are called variations. What does "average of the traits" mean?

I got this definition of variation in a book. Please elaborate on the meaning of average of the traits in it.

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The concept that is being referred to is known as heritability. This describes how much genetics plays a role in the differences(variations) in a population. An example could be height. People have a great variation in their height. Heritability which is often studied in quantitative genetics attempts to learn the relative contributions of genetic and non-genetic differences in the phenotypic variation of a population. In other words, if we observe height, how much is due to genetics, how much is due to the environment to account for the different phenotypes among people.

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