Which of the following is not true of mutations?
a. mutations can't result in a change in appearance.
b. a mutation can result in a change of function.
c. mutations can be passed from parent to child.
d. a mutation is permanent.

B. A mutation can result in a change of function.  Not all mutations can cause negative effects, but a single mutation is capable of causing profound effect on the physiology and cellular structure of organisms. It can alter the function of proteins causing permanent diseases.