What is a trait?
Biologists use the terms "trait" and "phenotype" interchangeably. They both describe the expressed characteristics of an organism. The color of a leaf, the height of a plant, the smell of a flower – these are all traits. This is not the same as an organism's genotype, although traits are clearly influenced by genes. The traits of an organism are influenced by the environment as well. Think of a scar on a leaf due to insect herbivory. Or how the amount of sunlight affects the way a plant grows.
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