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An acquired characteristic is a non-heritable change in a function or structure of a living biotic material caused after birth by disease, injury, accident, deliberate modification, variation, repeated use, disuse, or misuse, or other environmental influences.
In this way, why do traits have to be heritable?
In principle, it is easy to determine whether any genetic variation influences the phenotypic variation among organisms for a particular trait. Traits are familial if members of the same family share them, for whatever reason. Traits are heritable only if the similarity arises from shared genotypes.
Hereof, what is the difference between heritable and non heritable traits?
However, it is important to keep in mind that a trait can be heritable due to genetics (G) or environment (E) – that whole nature vs. nurture argument. The important thing to keep in mind is that inherited traits are directly passed down from parents to children, whereas heritable traits are not necessarily genetic.
Heritability is a measure of how well differences in people's genes account for differences in their traits. Traits can include characteristics such as height, eye color, and intelligence, as well as disorders like schizophrenia and autism spectrum disorder.