Outline and Evaluate the Relationship Between Sexual Selection and Human Reproductive Behaviour (25 Marks)

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Darwin, who introduced the evolutionary theory, defined sexual selection as certain behaviours which are due to selective pressure from the social environment meaning, an individual is selected on the basis of reproductive success. Features that show signs of reproductive success is attractive to the opposite sex as well as chances of survival, and also enables them to compete, increasing the individual’s chance of reproduction. According to Trivers (1972), the sex which invests least in the process of reproduction will compete for the sex that invests less. Intra-sexual selection is used to define those who compete within a species to attract a mate. As males are less investing, they compete within themselves through intra-sexual selection to achieve the dominant position of the alpha male and so have exclusive access to females. Evidence which supports this refers to ‘sexual dimorphism’ which is the difference in size between males and females. Males tend to be physically larger and stronger than a female which is consistent with the claim that they must compete for access to females. Therefore dimorphism is evidence for intra-sexual selection and polygymy as it suggest males fight for females. Inter-sexual selection refers to the selection of characteristics between the genders which females take upon. Fisher’s “good taste” hypothesis, also known as the ‘sexy sons’ hypothesis, suggests females selection will be based on desirable characteristics as her offspring will develop these thus continuing her genes. This becomes a runaway process. Zahavi’s “good genes” hypothesis, states, characteristics such as the peacock’s tail, which attracts predators, are a sign of good genes as they have managed to survive despite the handicap, also indicating signs of good health, as they can only manage the handicap. This leads to them being selected as they possess a good

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