Evolution Depends on Both Inheritance and Selection

1098 Words Feb 26th, 2018 4 Pages
Heritable traits having some advantage to an organism must be passed on from one generation to the next. As a result, the organisms that have inherited these traits will be better suited for survival in a specific environment. In other words, the ability for an individual to survive is not enough to fuel evolutionary progression- there must be reproduction taking place as well (Figure 1).
Animal species that reproduce sexually have developed mating systems that allow them to produce the most successful offspring possible. To produce successful offspring, individuals choose a mate based on the characteristics that will be passed on to their young. Mating systems have developed by organisms learning to recognize which potential mates possess traits that would be beneficial to future generations. Individuals chose their mates based on many factors, two of the most important ones being the physical characteristics and territorial acquisitions of the potential mates (Vehrencamp and Bradbury 1984). Both of these factors that influence mate choice are examples of sexual selection existing in nature. The theory of sexual selection revolves around the assumption that some members of a species are born with a genetic makeup that allows them to have a mating advantage over other members of that species. This mating advantage comes from the individual possessing traits that are more desirable by the opposite sex, as far…