3.27 understand that many mutations are harmful but some are neutral and a few are beneficial

3.27 •mutations are usually harmful

                  •mutations in reproductive cells kills or makes the offspring abnormal 

                  •mutations in body cells multiply uncontrollably - cancer 

                  •some mutations have no effect 

                  •rarely are they beneficial, giving a survival advantage 

                  •this is natural selection e.g mutated bacterium may be resistant to antibiotics