Q. A population of humans lives on a fictional isolated island. 75% of the population has purple hair, not found naturally in any other human populations. The purple hair is the result of a single gene locus, for which there are two alleles; purple hair, and non-purple hair (resulting in one of the typical human hair colors, which are determined by other genes).
Which of the following describes a reason the island population fails to meet Hardy-Weinberg equilibrium requirements for purple hair locus?