Relationships: Factors Affecting Attraction (L1-4) Flashcards
(62 cards)
What is Darwin’s concept of sexual selection?
- about the selection of characteristics which aid successful reproduction rather than survival
- but clear that reproduction ultimately aids survival
- certain physical characteristics like male peacocks tail are a sign of genetic fitness
- so female ones who select a male with certain tails are more likely to produce robust offspring which would continue into future gen
What features are referred to as adaptive?
- they are an advantage and act as competition against other males for reproductive rights
- such as aggression
- means that is this aggressive male then reproduces then is likely this trait will remain in the population
What is the basis of human behaviour?
- anisogamy
What is anisogamy?
- refers to the differences between male and female sex cells, gametes
Female sex cells?
- eggs or ova
- large
- static
- produced at intervals for a limited number of fertile years
- require significant investment of energy
Male sex cells?
- sperm
- very small
- very mobile
- created continuously in vast numbers from puberty until old age
- do not need much energy to be produced
What is a consequence of anisogamy?
- no shortage of fertile males
- fertile female is a rarer source since egg production is finite due to menopause
What does anisogamy give rise to?
- 2 types of sexual selection
1. inter-sexual selection
2. intra-sexual selection
What is inter-sexual selection?
- between sexes
- strategies that males and females use to select the other sex
- preferred strategy of female since quality over quantity as sperm is plentiful
What are the male strategies to increase opportunities for mating success?
- courtship rituals
- size
- sperm competition
- mate guarding
- sneak copulation
What is meant by courtship rituals, male?
- allow males to display genetic potential
- through characteristics and resource abilities
What is meant by size, male?
- males evolve to be bigger
- shows strength for success in comp with other males
- includes weaponry in some other species like antlers in deer
What is meant by sperm competition, male?
- action of natural selection on males
- makes them more competitive by producing larger testicles, bigger ejaculations and faster swimming sperm
What is meant by mate guarding, male?
- male fear of being cuckolded
- and spending resources raising another males child
- indulge in mate guarding to keep an eye on their partner
- remain in close contact with female partner to prevent them mating with other males
What did Buss (1993) suggest regarding mate guarding?
- men are fearful of partners being sexually unfaithful
- women worry about emotional unfaithfulness, due to fear of their partner spending resources on other females
What is sneak copulation, male?
- males mating with other females as well as their partner if given opportunity
- to increase chances of reproductive success
- women also gain as offspring have different fathers
- increases wider genetic diversity which increases survival
- females can benefit if partner is a rich man but then gets pregnant from genetically fit ‘stud’ but if caught risks abandonment
What are the female strategies for inter-sexual selection?
- sexy sons hypothesis
- handicap hypothesis
- courtship
What is the sexy sons hypothesis, female?
- devised by Fisher (1930)
- argued that females select attractive males as they will produce sons with the same attractive features
- increasing their sons and their own reproductive fitness
What is the handicap hypothesis, female?
- Zahavi (1975) believes females elect males with handicaps
- allows them to display superior genetic quality
- may find males who drink or take drugs attractive as their ability to care for them demonstrates their genetic fitness
What is courtship, female?
- use courtship to select males on the basis of reproductive fitness
- done through males demonstrating strength, health and ability to provide resources
- prolonged courtship benefits females as males must then invest time, effort and resources
- increases the chances of the male not deserting their partners after a successful damage
What is intra-sexual selection?
- within each sex
- strategies between males to be the one who is selected
- preferred selection for males, quantity over quality as they have enough sperm
- comp between males to be selected to mate with a female
- winner then gets to pass on their characteristics to their offspring
- losers do not get to reproduce and pass on their characteristics
What has intra-sexual selection given rise to?
- dimorphism, two forms
- males and females look different
- males likely to have physical competition so ice is considered, larger means more likely to reproduce
- females do not need to compete so no evolutionary drive favouring larger females
- in females, youthfulness is important since males prefer younger and more fertile females
What are the behavioural consequences of intra-sexual selection?
- can be controversial
- such as males being more deceitful, intelligent and aggressive as these characteristics are needed to win the female against other males
- in order to retain their mate, males must also behave aggressively to protect their mate from others so aggression is necessary
Evolutionary explanation for partner preferences +ve:
- research support for inter sexual selection
- Clark and Hatfield sent m+f psych students out to uni capus
- went to other students alone and said “I have been noticing you around campus. I find you very attractive. Would you go to bed with me tonight?”
- no female agreed
- 75% of males agreed instantly
- supports view that females are choosier than males when it comes to sexual partner selection
- men instead evolved different strategy to ensure reproductive success
= Pawlowski and Dunbar examined idea that older women don’t disclose true age in personal advertisements
= since men judge partners based on age due to link to fertility
= was true for women between 35-50, hid age to find high quality partners before menopause
= supports intersexual selection - research support for intra
- David Buss used survey for over 10k adults in 33 countries
- asked q’s relating to various attributes that evolutionary theory predicts about intra sexual selection
- found f place greater value on resource related attributes like money and ambition than m did
- m valued physical attractiveness and youth so good reproductive capacity more than females
- supports idea that each gender competes with each other to gain sexual partner for different reasons