Neutral mutations or Silent point mutations, are neutral because they do not change the amino acids in the proteins they encode. Many other mutations have no effects on the organism because they are repaired before protein synthesis occurs.
90 percent of DNA expected to be non-functional, and mutations occur there usually have no effect. The other 10 percent functional, and have influence on the properties of the organism, as those used to direct the synthesis of proteins that guide the metabolism of the organism. So many examples color of white bears, size of ears, color of eyes etc. etc. Correct the spelling in the question "Neural" to"Neutral"