Articles > Quizzes & Surveys > Gene definition – quiz Gene definition – quiz Quiz Choose the best answer. 1. The fundamental, physical, and functional unit of heredity Genotype Gene Chromosome 2. A gene is made up of ... nucleic acids nucleotides chromosomes 3. The complete set of genetic material in an organism Genome Allele Gene 4. Gene variants Genome Allele Genotype 5. Gene expression Transcription Translation Transcription and translation Send Your Results (Optional) Your Name To Email Time is Up!