Relationships Flashcards
What does natural selection suggest?
Suggests that characteristics that confer a survival advantage are passed on to produce offspring with the best genes. This is because these characteristics are adaptive and therefore the individuals are more likely to survive and be able to reproduce.
What is sexual selection?
An evolutionary explanation of partner prefrence. it suggests that charcteristics that confer a reproductive advantage (i.e. are attractive to the opposite sex or provide an advantage over competitors for reproductive rights) are passed on to produce offspring with the best genes. This is effectively ‘survival of the sexist’. In sexual selection, an individual’s survival is not at stake, but rather their ability to leave more descendants.
What is human reproductive behaviour?
Any behaviours (actions) that relate to opportunites to reproduce and therefore increase survival chances of our genes.
What is anisogamy?
The difference between male and female sex cells.
What are the charcteristics of sperm?
- Extremely small
- Highly mobile
- Created continously in vast numbers
- Created from puberty to an old age
- Do not require a great expenditure of energy to produce
What are the charcteristics of ova?
- Relatively large
- Static
- Produced at intervals
- Produced at intervals for a limited number of fertile years
- Require a huge investment of energy to produce
What are the two types of mating strategies and who uses them?
Inter-sexual selection (females use to select males) and intra-sexual selection (males use between each other to be the one that is selected)
Why is inter-sexual selection used by women?
Anisogamy dictates that the consquences for women choosing substandard partner is much more serious than for males because females make greater investment in terms of time, commitment and other resources before, during and after the birth of her offspring.
Combinded with there being no shortage of fertile males, it pays of for women to be especially choosy in short-term relationships so that any offspring are of a higher quality (i.e. have the best genes) and so their genes are much more likely to be passed on.
What is the females optimum strategy for relationships?
For both long-term and short-term relationships it is to prefer and select a genetically fit partner (e.g. tall, strong and so are able to physically protect her and her children) who is willing to provide resources (e.g. shelter for her and her offspring, food ect). This results in a preference for wealthy, older males.
Why are men less choosy about who they mate with?
Anisogamy dictates that the male’s optimum strategy is to mate with as many fertile females as possible. This is because of the minimal energy required to produce sperm and the relative lack of post-coital reponsibility. This results in an increased probability that they will reproduce and pass on their genes.
What do men prefer in women?
Males have a distinct preference for fertility and sensitivity to the indicators of youth (e.g. certain facial fetaures) and fertility (e.g. certain body shapes like an hourglass figure) as these are signs of reporductive value.
Evaluation: Sexual selection: What happened in Clarke and Hatfield’s (1989) study?
Sent male and female psychology students out across a university campus. They approaches other students individually with this question: ‘I have been noticing you around campus. I find you very attractive. Would you go to bed with me tonight?’ Not a single female student agreed to the request, whereas 75% of men did, immediately.
Evaluation: Sexual selection: How does Clarke and Hatfield’s (1989) study impact our understanding of relationships between sexual selection and human reproductive behaviour?
Supports sex differences in human reproductive behaviour are precited by anisogamy from sexual selection theory and supports the predictions about short-term mating strategies. Males evolved innate mechanisms favouring short-term relationships to maximise their chances of reproductive success, whilst women are choosier to increase the likelihood of high quality offspring. Therefore, this supports the validity of the theory as an explanation of reproductive behaviour.
Evaluation: Sexual selection: Counter argument for Clarke and Hatfield’s (1989) study?
It could be argued that there is a gender bias to attribute short-term mating strategies only to men, as even though men are more liekly to want to casual sex and a variety of sexual partners, these mechanisms could have evolved without the presence of willing females. Perhaps there may have been benefits for women to undergo in short-term relationships e.g. allowing them to leave unrewarding relationships if their partner discovered their infidelity or to increase the genetic diversity if their offspring. This type of gender bias is known as alpha bias as it overestimates the differneces between the sexes.
Evaluation: Sexual selection: What did Singh (1993, 2002) study?
Studied the waist: hip ratio in females. He found that what matters in male prefrence in not female body size so much, but the ratio of waist to hip sizes. Up to a point, men generally find any waist and hip sizes attractive as long as the ratio of one to the other is about 0.7. This combination of wider-hips and narrower waist is attractive because it is an ‘honest signal’ (hard to fake) that the women is fertile but not currently pregnant.
Evaluation: Sexual selection: How does Singh’s (1993, 2002) study impact our understanding of relationships between sexual selection and human reproductive behaviour?
Supports sex differences in partner preference’s that were predicted by anisogamy from sexual selection theory in that it suggests that men have an innate adaptive mechanism to identify and prefer women with a low waist: hip ratio as the most attractive as it’s a sign of reproductive value, increasing their likelihood of reproducing. This can be seen through history in fashion through corsets. This supports the validity of the theory as an explantion of human reproductive behaviour.
Evaluation: Sexual selection: What is a weakness of sexual selection theory?
Partner preference over the last century have undoubtedly been influenced by rapidly changing social norms of sexual behaviour. These develop much faster than evolutionary timescales imply and have instead become about due to cultural factors, such as availability of contraception. Women’s greater role in the workplace means that they are no longer dependent on men to provide for them. Researchers argue that this social change has consquences for women’s mate preferences which may no longer be resource-ordinated. Research comapred partner preferences in China over 25 years and found that some had changed and some had remained the same, corresponding with huge social chnages in the time.
Evaluation: Sexual selection: How does the weakness of the theory impact our understanding of relationships between sexual selection and human reproductive behaviour?
This is a weakness of the sex differences in partner prefrence that are predicted by anisogamy from sexual selection in that mate preferences are the outcome of a combination of evolutionary and cultural influences. Any thoery that fails to consider both is therefore a limited explanation of human reporductive behaviour and so we can’t argue the theory is completely valid.
Evaluation: Sexual selection: What did Waynforth and Dunbar (1995) study?
Studied lonley heart adverts in American newspapers. These were opportunites for men and women to describe their qualities that they desired in a partner whilst also sharing what they had to offer. The researchers found that women more than men tended to offer physcial attractiveness and indicators of youth (e.g. flirty, exciting, curvy, sexy). Men on the other hand, offered resources more than women did (e.g. sucessful, fit, mature, ambitious) and sought relative youth and physical attractiveness.
Evaluation: Sexual selection: How does Waynforth and Dunbar’s (1995) study impact our understanding of relationships between sexual selection and human reproductive behaviour?
This supports sex differences predicted by anisogamy and supports predications for long-term mating strategies for women (preferring reources to ensure provision for her and her offspring and therefore teh offspring surviving), and short and long-term strategies for men (preferring signs of fertility to increase their likelihood of reproducing). This therefore reflects an innate adaptive mechanism for identifying and preferring signs of fertility and resources, supporting the theory.
What are the two theories of physical attractiveness?
Physical attractiveness theory and the matching hypothesis theory
Physical attractiveness theory: What is physical attractiveness?
Is thought to be an important factor in the formation of romantic relationships. It usually applies specifically to how appealing we find a person’s face. There exists the assumption that we seek to form relationships with the most attractive person available.
Physical attractiveness theory: Why is physical attractiveness important?
One explanation for the importnace of physical attractiveness in attraction comes from evolutionary theory. Shackleford and Larsen found (1997) found that people with symmetrical faces are rated as more attractive. This is because it may be an honest signal of genetic fitness (you can’t fake it)!
Physical attractiveness theory: Why other faces are people attracted to and why?
Faces with neotenous (baby-face) features such as widely seperated and large eyes, a delicate chin and a small nose. This is because they trigger a protective or caring instinct.
Physical attractiveness theory: Why does physical attractiveness matter?
Because of the physical attractiveness stereotype.
Physical attractiveness theory: What does the physical attractiveness stereotype suggest?
That attractive people are kind, strong, sociable and succesful compared to unattractive people. This makes them even more attractive to us, so we behave positively towards them (self-fulfilling prophecy).
Physical attractiveness theory: What is the halo effect?
One distinguishing feature of a person (their physcial attractiveness in this case) disproportionately infleunces our judgements of their other attributes (their personality)
Matching hypothesis: Who does the matching hypothesis suggest we are attracted to?
Because common-sense tells us that we can’t all form realtionships with the most attractive people, the matching hypothesis suggests that people are attracted to people who approximately ‘match’ us in physical attractiveness.
Matching hypothesis: What must we do?
We must make a realistic judgement about our ‘value’ to a potential partner.
Matching hypothesis: What is our choice of partner a compromise between?
Compromise between desiring the most physically attractive partner possible and avoiding being rejected by someone who is unlikely to consider us physically attractive.
Physical attractiveness: Physical attractiveness theory: What is supporting evidence?
Palmer and Peterson (2012) found that physically attractive people were rated as more politically knowledgeable and competent than unattractive people. This halo effect was so powerful that it persisted even when partipants knew that these ‘knowledgeable’ people had no particular expertise. This existence of the halo effect has been found to apply in many other areas of life too.
Physical attractiveness: Physical attractiveness theory: What does the supporting evidence tell us about physical attractiveness in terms of attraction?
This supports that physical attractiveness is an important factor in the formation of relationships, romantic or otherwise. By being physically attractive, it seems that this distinguishing feature disproportionately influences voters’ judgements of the politicans’ knowledge and competency (halo effect). This has implications for the political process; it suggests that there are dangers for democracy if politicans are judged as suitable for office just because they are considered physically attractive enough by voters.
Physical attractiveness: Physical attractiveness theory: What is undermining evidence?
Some people do not seem to attach much importance to physical attractiveness. In a study by Touhey (1979), male and female partipants rated how much they would like a person based on their photograph and some biological features. They also completed a questionaire designed to measure sexist attitudes and behaviours. It was found that the partipants who scored highly on the questionaire were more infleunced by physical attractiveness of the individual when judging likeability. Low scores were less sensitive to this influence.