Dating coupling and mate selection
Ideas on sexual selection were first introduced in 1871, by Charles Darwin, then expanded on by Ronald Fisher in 1915.At present, there are five sub mechanisms that explain how mate choice has evolved over time.Williams emphasised its importance in the 1960s and 1970s.In 1972, soon after Williams' revival of the subject, Robert L. Trivers defined parental investment as any investment made by the parent that benefits his or her current offspring at the cost of investment in future offspring.A choosy mate tends to have preferences for certain types of traits—also known as phenotypes—which would benefit them to have in a potential partner.
This became known as Bateman's principle, and although this was a major finding that added to the work of Darwin and Fisher, it was overlooked until George C.
These investments include the costs of producing gametes as well as any other care or efforts that parents provide after birth or hatching.
Reformulating Bateman's ideas, Trivers argued that the sex which exhibits less parental investment (not necessarily the male) will have to compete for mating opportunities with the sex that invests more.
Fifteen years later, he expanded this theory in a book called The Genetical Theory of Natural Selection.
There he described a scenario where feedback between mate preference and a trait results in elaborate characters such as the long tail of the male peacock (see Fisherian runaway).