chromosomal dna

anatomical drawing spiral labeled body aging located histone system fiber transcription biochemistry nucleosome educational eukaryotic proteins nucleolus graphic microbiology material stages cytosine structural adenine supercoiling thymine recombination chromosomal disorder inversion mutation illness chromatids rna abnormalities abnormal abnormality long arm short chromosome dna reproduction biotechnology scientific telomere research chromatid division chromosomes science sequence genome diagram structure chromatin nucleus health chromosome biology genetic human vector model helix design cell anatomy medical double molecule microscopic evolution medicine genes gene centromere molecular