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Discuss the relationship between sexual selection and human reproductive behaviour

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Introduction

Discuss the relationship between sexual selection and human reproductive behaviour.

Charles Darwin’s theory of natural selection proposed that at any time in which the natural environment exerts selective pressure on an individual. The pressure separates those who do fit into the environment from those who do. Fitness is the extent to which the individual’s characteristics are adapted to its environmental niche. However natural selection can’t explain why many animals develop exaggerated characteristics that appear to threaten rather than enhance the chances of survival.

 Darwin solved this problem with the sexual selection concept. Sexual selection is the selection of characteristics that are concerned solely with success of reproduction. In general the females of any given species tend to be the choosers whereas the males are the ones who compete to be selected.

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Middle

Sometimes in female humans, dishonest signals are sent out by falsely altering there looks by make-up and plastic surgery to make themselves look more attractive to male humans. I think however as time goes on more and more males find things like too much make up etc unattractive as it does not portray natural beauty and so naturally their children will not have the genes they want them to have.

The fact is that humans are a mutually selecting species Humans are pre-programmed due to adaptation in our EEA to display indicators of good genes. The healthiest generally make better use of the indicators that they have.

Parental investment theory (Trivers, 1972) states that males and females do not invest equally. Females initial investment is a lot greater than males.

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Conclusion

        Males expend a large part of their reproductive effort on courtship and mating and thus hardly any time on parental care. Sexual jealousy may have evolved as a solution to the problems of cuckoldry (males) and loss of resources (females). Buss et al. (1992) found that male students where more worried about there girlfriend have sexual relations with another person whereas females students where more concerned their boyfriends being emotionally involved with another women.

Mark Williamson

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