What are the main reasons for the variability of hereditary traits.

Genetic variation can be identified by continuous or discrete traits. Continuous traits are traits that are constantly changing, such as height or weight. Discrete traits are features that can only be measured discretely, such as curling the tongue into a tube – you either can or you cannot.

Sources of genetic variation. There are three sources of genetic variation in hereditary traits: mutation, gene flow, and sexual reproduction.

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