Sex Change and Sexual Selection

Abstract

A mathematical theory is presented in terms of selection circumstances that favor a sex change. Disadvantages of hermaphroditism and the values of it are discussed. Sexual selection, mating systems and fertility gain are all considered. The bluehead wrasse (Thalassoma bifasciatum) is used as an example. Sex change may be genetically controlled or triggered by external events such as the loss of a dominant male from his harem.