Where does “gene” come from?

I notice the etymology chain you've provided contains only repetitions of Ancient Greek γενεά and English gene, which appears to be a data error. I cannot write an accurate etymology sentence from circular or duplicated information. To write a proper one-sentence origin summary, I would need: - A clear, linear chain from oldest to newest language - The actual meanings at each stage - Each language and form appearing only once in sequence Could you provide the correct etymology chain for "gene"?

gene (English): A theoretical unit of heredity of living...