Smoking Monkey

Female chimpanzees also have a hierarchy which is influenced by the position a female individual within a group. In some chimpanzee communities, the young females may inherit high status from a high-ranking mother. The females will also form allies to dominate lower-ranking females. In contrast to males who have a main purpose acquiring dominant status for access to mating privileges and sometimes violent domination subordinates, females acquire dominant status for access to resources such as food. High-ranking females will ten get first access to resources. In general, both genders acquire dominant status to improve social standing within a group.
Its ten the females who choose the alpha male. For a male chimpanzee to win the alpha status he must gain acceptance from the females in the community as they are the ones who actually dictate the way the lifestyles are set up (the females are the ones who ensure the survival the next generation; they have to make sure that their group is going to places that supply them with enough food). There are cases where a group dominant females will oust an alpha male who is not to their preference and rather back up the other male who they see potential leading the group as a successful alpha male.