Final answer:
A gene is a segment of DNA that encodes specific traits through proteins and alleles, with expressions influenced by the environment.
Explanation:
A gene is a locus (or region) of DNA that encodes a functional RNA or protein product, and is the molecular unit of heredity. Genes are sequences of DNA that code for particular traits, with different versions known as alleles. The expression of genes can be influenced by the environment, and some genes produce more than one protein.
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