Relationships Flashcards
(133 cards)
Definition of Human Reproductive Behaviour
Behaviours related to the opportunity to reproduce and increase survival chances of our genes
2 Behaviours Included in Human Reproductive Behaviour
- Mate choice
- Mate competition
Definition of Natural Selection
Biological selection of characteristics that increase an organism’s chance of survival
Definition of Sexual Selection
Biological selection of characteristics that increase an organism’s chance of reproductive success
What is Natural Selection the Survival of?
The fittest
What is Sexual Selection the Survival of?
The sexiest
Definition of Anisogamy
The differences between make and female gametes
Sperm Cells and Biological Males - 5 Points
- About 110 million sperm per ejaculation
- Fertile for a long period of life
- Can fertilise many people with little cost to reproductive potential
- Look for signs of fertility to enhance reproductive success - health, youth, childbearing hips
- Cannot be certain of paternity so makes sense to engage in polygamy
Egg Cells and Biological Females - 6 Points
- Ovulate once a month
- Fertile for about 25 years of life
- Produce few eggs, which are a large reproductive investment
- Look for signs of genetic fitness - strength, status, resources
- Can always be certain of maternity so makes sense to engage in monogamy
- Makes sense to be selective when choosing mate as mating involves a large reproductive cost
2 Mating Strategies
- Inter-sexual selection
- Intra-sexual selection
Definition of Inter-Sexual Selection
Strategies for selection between the sexes
Definition of Intra-Sexual Selection
Strategies used between members of the same sex to be selected
Inter-Sexual Selection - 8 Points
- Preferred strategy of the female - quality over quantity
- Trivers - females invest more time, commitment and resources before, during, and after the birth of their offspring
- More important for females to be picky as they lose more than males by investing in a sub-standard partner
- Female preference for genetically fit males determines features which get passed on
- Runaway process example - if height is attractive, females will mate with tall males and produce taller sons and daughters with a preference for tall males
- Runaway process is apart of Fisher’s ‘Sexy Sons Hypothesis’
- Female mates with a male with a desirable characteristic that gets inherited by her son, which makes it more likely that future generations will mate with her offspring
- Some inter-sexual selection for males as they must choose females with indicators of fertility - young, childbearing hips
Intra-Sexual Selection - 7 Points
- Preferred strategy of the male - quantity over quality
- Involves competition between males to be the one that gets to mate with the female
- Led to dimorphism
- Example - for competing males, height matters so larger males are selected, but there is no evolutionary drive favouring larger females
- Has behavioural and psychological consequences
- Example - to acquire and protect fertile females from competition, males may behave aggressively or even benefit from thinking in certain ways
- Anisogamy suggests the optimum mating strategy for males is therefore to mate with as many fertile females as possible
Definition of Dimorphism
Obvious differences between males and female
Research into Sexual Selection and Human Reproductive Behaviour A03 - Research Support for Preferences Linked to Anisogamy - 4 Points
- Buss - survey of > 1,000 adults in 33 counties, asking questions about age and characteristics that evolutionary theory predicts to be important for partner preference
- Females found to place more emphasis on resource-related characteristics, such as good financial prospects and ambition
- Males found to place more emphasis on reproductive capacity, such as good looks, chastity, and preferred younger mates than females
- Gives credibility to the idea that sex cell differences will affect the mate selection process
Research into Sexual Selection and Human Reproductive Behaviour A03 - Research Support for Inter-Sexual Selection - 6 Points
- Clark and Hatfield - male and female students approached by a confederate that said they find them attractive and asked whether they would go to bed with them that night
- 100% of females said no and 75% of men said yes immediately
- Suggests female choosiness in heterosexual relationships is a reality
- Increases credibility of idea that females will be selective over mates as reproduction for them is a large investment, whilst males will not be selective as they benefit from polygamy to pass on genes
- However, when looking for a long-term partner, sexual strategies for males and females become much more similar, with both being choosy and looking for loyalty
- Too simplistic to suggest one strategy is adaptive for all males and the other adaptive for all females
Research into Sexual Selection and Human Reproductive Behaviour A03 - Ignores Social and Cultural Influences - 5 Points
- Social norms around sexual behaviour have changed rapidly in recent history, much faster than evolutionary timescales suggest such as the availability of contraception, meaning sex can be for pleasure
- The theory doesn’t account for homosexual relationships and those who do not want children
- Women’s position in society also means they no longer financially depend on men
- Bereczeki et al - says this changes female partner preferences to no longer be so resource-oriented
- Limited explanation as it does not account for wider social and cultural context
Research into Sexual Selection and Human Reproductive Behaviour A03 - Research Support for Men Choosing Indicators of Fertility in Women - 5 Points
- Singh - found men have a universal preference for low waist to hip ratios, with the ideal measurements standing at 36” - 24” - 36”
- This is an indicator of health and fertility as the waist to hip ratio becomes lowest during the fertile phase (ovulation) of the menstrual cycle
- A woman who is pregnant with another man’s child cannot maintain a low waist to hip ratio
- This can also explain the intra-sexual selection strategies of females who wear corsets, or crop tops, to accentuate their low waist to hip ratio
- Gives credibility to the idea that men select fertile mates to increase chances of reproductive success
Research into Sexual Selection and Human Reproductive Behaviour A03 - Research to Support The Idea That Men and Women Will ‘Offer’ Characteristics Linked to Sexual Preferences in the Opposite Sex - 4 Points
- Waynforth and Dunbar - studied ‘Lonely Hearts’ ads, which gave men and women the opportunity to describe what they wanted from a potential partner and catalogue what they had to offer them
- Women tended to offer characteristics related to physical attractiveness and indicators of youth , such as ‘sexy’ and ‘curvy’
- Men tended to offer their resources, such as ‘successful’, ‘mature’, ‘ambitious’, whilst seeking youth and physical attractiveness
- Gives credibility to ideas stemming from anisogamy that women will seek resources due to reproduction being a large investment, whilst men will seek signs of fertility to impregnate as many women as possible
Definition of Self-Disclosure
The gradual process of sharing personal information and revealing the inner self to someone
Social Penetration Theory - 4 Points
- Altman and Taylor - proposed SPT, which discuss how relationships develop, with self-disclosure being a big part of this
- Involves reciprocal exchange of information - when one reveals information they display trust, and for this to go further, the other must also disclose personal information
- With more disclosure, partners ‘penetrate’ more into one another’s lives and understand each other
- SPT includes 2 elements to self-disclosure, breadth and depth, which is illustrate with the onion analogy
Onion Analogy of SPT - 4 Points
- At the beginning of a relationship, we disclose lots of broad information, but it is low risk and and lacks depth - these are things we would share with most people
- In the early stages, we must be careful of sharing too much information, as revealing too much can threaten a relationship before it starts
- As relationships develop, self-disclosure increases in depth (removing the layers of the onion) and the breadth of acceptable topics to be discussed increases
- Eventually we reveal high-risk and intimate information (at the core of the onion), such as painful memories, strong beliefs and secrets
Definition of Depenetration
The process of a dissatisfied partner disclosing less as they disengage from a relationship