Small changes to the DNA sequence useful for crop improvement, while larger changes (at the level of chromosomal and cellular) always give some level of imperfections and even deadly. One way to classify mutations in the DNA sequence level mutations is to categorize on the basis of how the modification affects the gene’s ability to synthesize proteins that are responsible for the character. In general, it is important mutations in crop improvement usually involves only one or a fundamental part and does not affect the synthesis of proteins.