sexual selection is when certain traits are favoured for reproductive success
these traits increase reproductive success, eg strength, height, aggression, wide hips etc confer an evolutionary advantage
individuals with these traits are more likely to survive and pass on the genes responsible
inter-sexual selection where traits increase ‘attractiveness’ and induce members of the opposite sex to mate with them e.g. sexual selection via female mate choice eg males show good genes/resources, females show youth/fertility
intra-sexual selection where traits allow an individual to compete with members of the same sex for access to mating opportunities e.g. male competition
anisogamy – differences in male/female sex cells result in different strategies for reproductive success
