[{"term": "DNA", "definition": "Deoxyribonucleic acid; the molecule that carries genetic instructions."}, {"term": "Gene", "definition": "A segment of DNA that codes for a specific protein or trait."}, {"term": "Chromosome", "definition": "A structure made of DNA and proteins; humans have 46 (23 pairs)."}, {"term": "Dominant Trait", "definition": "A trait that is expressed when at least one dominant allele is present."}, {"term": "Recessive Trait", "definition": "A trait that is only expressed when two recessive alleles are present."}, {"term": "Natural Selection", "definition": "The process by which organisms with favorable traits are more likely to survive and reproduce."}]