Biology / Bio 1753 · Atom · ~20 seconds
"Acquired Traits Are Inherited"
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Traits an organism acquires during its own lifetime are not passed to its offspring, because only genetic variation in the germline is heritable.
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An athlete's gym-built muscle strength does not appear in offspring's genomes, since building muscle does not alter the athlete's germline DNA.
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This is the inheritance-of-acquired-characteristics idea Lamarck proposed before natural selection displaced it as the field's accepted mechanism.