Biology 3436F/G Lecture : Biology 3436F/G L16 &17.docx
5 Dec 2012
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A form of natural selection that occurs when individuals vary in their ability to compete with others for mates or to attract members of the opposite sex. Fighting which leads to evolution of antlers or claws (gain access to territories or mates) Barnswallows have biparental care (chicks would die without care form both parents) Cichlids suck up larvae in mouth to protect them from predators. A lot of defense involved; young can feed on their own so do not need parents help: there is variation in mating systems among animals, bateman"s principles reveal a difference between males and females in benefits to multiple-mating. Female ben = lots of resources: sexual selection involves competing for access to. Any investment by the parent in an individual offspring that increases the offspring"s chance of surviving (and reproducing) at the cost of the parent"s ability to invest in itself or other offspring mates and attracting mates.
