"Fragment length" refers to the size or length of a broken piece or part of something. It usually refers to the length of a broken DNA molecule or genetic material. Full definition
By the 1990s, DNA testing had advanced somewhat through the use of restriction fragment length polymorphism, but that technique required more material than was available. (canadianlawyermag.com)
The plasmids targeting each gene were respectively transfected into goat fibroblasts, and their genome modification efficiency was determined at day 3 using restriction fragment length polymorphism (RFLP) assay (see Methods). (journals.plos.org)
The DNA has fragmented in an uncontrolled fashion, creating a mix of fragment sizes — genome assemblers must use fragment lengths of specific size ranges. (reviverestore.org)