If certain alleles (e.g., PKU, Huntington's) produce their phenotypic effects across virtually all normal environments, then 'primarily genetic' attribution is empirically warranted for those traits.

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Alleles(as used in genetics): Different versions of the same gene that an organism can inherit. For example, you might have one allele for brown eyes and one for blue eyes.
Empirically warranted(as used in epistemology (how we know things)): Supported by real-world evidence and observation rather than just theory or belief. It means we have good reason to believe something based on what we can actually test or measure.
Huntington's(as used in genetics): A genetic disease that causes progressive damage to the brain, usually appearing in middle age and leading to movement problems and cognitive decline. It's used here as an example of a trait strongly caused by genetics.
PKU (Phenylketonuria)(as used in genetics): A genetic disorder where the body can't properly break down a certain amino acid, which can cause brain damage if untreated. It's a real-world example of a genetic disease.

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