Other helpful Mandarin phrases: While Mandarin has a wealth of generalized insults for the intellectually stunted (Sha gua means retard--literally stupid melon), it really brings the heat with insults that don't sound at all insulting.
frameshift mutation / frame-shift mutation; frameshift. A frameshift mutation is a genetic mutation caused by a deletion or insertion in a DNA sequence that shifts the way the sequence is read. A DNA sequence is a chain of many smaller molecules called nucleotides.
Insertion and deletion mutations can result in frameshift mutations, when the reading frame of the gene is changed. This frameshift only happens when the insertion or mutation is not a multiple of 3 nucleotides.