A process for preparing a processed sample liquid solution for gel electrophoresis, comprising (a) treating a sample comprising a cell suspension in a non-shearing manner to produce a processed sample liquid solution comprising a mixture of DNA fragments extracted from the cell suspension, wherein at least one of the DNA fragments is greater than 200 kilobase pairs and (b) transferring the processed sample liquid solution in a non-shearing manner directly to an electrophoresis medium for conducting electrophoresis.