Bateman’s principle states that variance in reproductive success is greater in males than females. Females always invest more energy to produce their offspring. Sperm are cheaper than eggs. Males reproductive success is limited by the number of mates. Female reproductive success is limited by how many eggs she can produce. This results in sexual selection in which males compete with each other. And females become choosy in which males to choose. As a result of Bateman’s principle, the predictions follow; males should try to mate with as many females as possible and should compete with other males for female attention. Females should try to choose the best mates. In addition, we expect higher variance in reproductive success in males compared to females.
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