The measure of the variability of behavioural traits among individuals that can be accounted for by genetic factors is called:

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Heritability is the measure of the extent to which genetic differences between individuals contribute to differences in their behavioural traits. It represents the proportion of phenotypic variance (i.e., the observed variation in a trait) in a population that can be explained by genetic differences. Therefore, heritability is often used to estimate the extent of genetic influence on a particular trait, and it ranges from 0 to 1.

The Measure of the Variability of Behavioural Traits Among Individuals