Determine which process of evolution is likely impacting the population below. Once you have determined which process of evolution is likely occurring for each problem, briefly explain why you selected that process.

1. The inhabitants of the island Trinity are all descended from one indigenous family and a few colonists. Violet eyes are much more common among these islanders than in any other human population. It is assumed that at least one of the original island settlers carried this rare allele. The violet eye disorder has an abnormally high frequency among this small population because many can trace descent to at least one member of the small group of colonists.

Which process of evolution likely affected this population in regards to the rare violet eye color allele? Explain your reasoning.