Unit 3: Relationships Flashcards
What does anisogamy refer to ?
the differences between male and female sex cells
Characteristics of male gametes ?
- small
- mobile
- created continuously
- do not require a lot of energy to produce
Characteristics of female gametes ?
- relatively large
- static
- produced at intervals
- limited number
- huge investment of energy
What is a consequence of anisogamy for mate selection ?
shortage of fertile women
What two types of mating strategy does anisogamy create ?
- intra-sexual selection
- inter-sexual selection
What is inter-sexual selection ?
strategy used between the sexes - who males select females and vice versa
What is intra-sexual selection ?
strategies within a sex to be the one that is selected
What is the preferred selection strategy of the female ?
Inter-sexual selection - as ova are rarer than sperm
Trivers (1972) :
female makes a greater investment of time, commitment and resources and stand to loose more
What is the runaway process ?
females mate with males who are deemed to have attractive traits, therefore this trait becomes more present in the population over time
What did Fisher create in 1930 ?
the sexy sons hypothesis
What does Fishers (1930) sexy sons hypothesis state ?
a female mates with a male with ‘desirable’ characteristics to increase the chance that females will mate with her offspring
What is the preferred selection strategy of the male ?
Intra-sexual selection
What has intra-sexual selection given rise to ?
dimorphism, the difference between males and females
What is a psychological consequence of intra-sexual selection ?
for males to acquire fertile females they may benefit from behaving aggressively
What does anisogamy dictate a males optimum mating strategy is ?
mate with as many fertile women as possible as it requires minimal energy and lack of post-coital responsibility
What is a behavioural consequence of intra-sexual selection ?
a distinct preference for indicators of youth as well as fertility
Supports of sexual selection :
+ Clark and Hatfield (1989)
male and female psychology students sent across a uni campus asking ‘I have been noticing you around campus. I find you to be very attractive. Would you go to bed with me tonight?’ no female students agreed while 75% of males did - supports evolutionary theory as females are choosier than males.
+ support from waist-hip ratio research
Singh (1993,2002) males will show a preference for a female body shape that signals fertility (WHR). size is not important but as long as the ratio between one and the other is 0:7 - ‘honest signal’ that a women is fertile but not pregnant
Criticism of sexual selection ?
- Chang et al (2011)
compared partner preferences in China over 25 years finding some had changed while others stayed the same - any theory that fails to account for cultural influences and just focuses on evolutionary ones is limited
Who created social exchange theory?
Altman and Taylor (1973)
What does social exchange theory state ?
when one partner reveals something they display trust and to go on further the other partner must reciprocate with revealing information about themselves - as more is disclosed the partners ‘penetrate’ more deeply into each others lives gaining a greater understanding of each other
According to Altman and Taylor what are the two elements of self-disclosure ?
- breadth
-depth
What is the breadth of disclosure at the start of a relationship ?
narrow - many topics are off limits
What do Reis and Shaver (1988) point out ?
for a relationship to develop, increasing in breadth and depth, there has to be a reciprocal nature to the disclosure