Answer:
Variability in a trait is due to a combination of environmental and genetic factors, where at least 50% can be attributed to genetic differences.
Explanation:
The heritability of a trait is the influence of both, environment and genes, on the <em>phenotype variation</em> among individuals. The <em>proportion</em> between phenotypic variation and variation in genetic values is defined as heritability.
There are 2 types of heritability: <em>Broad sense</em> (genetic variation due to dominance and epistasis) and <em>Narrow sense</em> (genetic variation due to additive genetic values).
<em>Heritability estimation</em> is based on observations and empirical data analysis, which used mathematical models like Breeder's equation and statistical analysis. An 0,50 value indicates that variability in a trait is due to a combination of environmental and genetic factors, and <em>genetic differences among individuals account for 50% of the variability in the trait</em>, so it can be inferred that the trait is very complex, like a multifactorial condition, for which the environment can play an important role.
