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[[File:Sexual_sele.jpg|thumb|right|400px|[http://www.dartmouth.edu/~robertcox/Teaching_files/lecture9.ppt Source]]] | [[File:Sexual_sele.jpg|thumb|right|400px|[http://www.dartmouth.edu/~robertcox/Teaching_files/lecture9.ppt Source]]] | ||
'''Selection''' refers to a mechanism that decides who gets to pass on their genes to the next generation. '''Sexual selection''' simply refers to selection done by members of the opposite sex e.g. in accordance to their ''mate preferences'', but also by related mechanisms like arranged marriages. Other kinds of selection are for example ''environmental'' or ''asexual selection'', referring to selection | '''Selection''' refers to a mechanism that decides who gets to pass on their genes to the next generation. '''Sexual selection''' simply refers to selection done by members of the opposite sex e.g. in accordance to their ''mate preferences'', but also by related mechanisms like arranged marriages. | ||
Other kinds of selection are for example ''environmental'' or ''asexual selection'', referring to selection done by the environment or ecology e.g. due to famines, disease or natural death, and everything else that is not sexual. Further, there is ''kin selection'', referring to how the individual influences the [[reproductive success|reproductive success]] of his relatives in which the individual's genes have interest in due to the genetic similarity of relatives. E.g. altruism within families may be kin selected. Lastly, there is ''group selection'', i.e. selection based on how the individual affects the survival and reproduction of entire groups. If a mutation results in better group survival, then that mutation may stick around because it may also (slightly) increase the individual's reproductive success. | |||
=== Sexual selection can increase but also decrease fitness === | === Sexual selection can increase but also decrease fitness === |