10. Variations Causing Harmless Changes
Some of the variations that occur in the coding and regulatory regions of genes have "harmless" effects. They can, for example, change the way a person "looks." Some people have blue eyes, others brown; some are tall, others short; and some faces are oval, others round.
Other variations in coding regions are harmless because they occur in regions of a gene that do not affect the function of the protein made.