Biology / Bio 0835 · Atom · ~20 seconds
Genes, Traits, and Variation
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A trait is one observable variant of a characteristic a gene controls; a species' variation arises from allele combinations each individual inherits.
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Hair color is a characteristic; blonde, brown, and black are traits from different gene combinations.
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A trait like eye color reflects normal variation, not a defect — variation across a population is expected, not an exception.