Relationships Flashcards
Define sexual selection
An evolutionary explanation of partner preference. Attributes or behaviours that increase reproductive success are passed on and may become exaggerated in succeeding generations. This explains why disadvantageous characteristics may be passed on and hence determines which genes are passed due to heredity
Define human reproductive behaviour
This refers to any behaviours which relate to opportunities to reproduce and thereby increase the survival chances of our genes. It includes the evolutionary mechanisms underlying our partners preferences, such as mate choice and mate competition
What is anisogamy?
The idea that there are differences between male and female gametes. Male sperm are small, highly mobile, continuously created from young to old and do not require massive energy. Female ova are large, static, produced in intervals in a Iimited time and require a huge investment of energy
What are the consequences of anisogamy?
- No shortage of fertile males, but a fertile female is rare in comparison
- Reflects the two types of sexual selection
Define and describe the two types of sexual selection?
Intersexual selection is between the sexes and how one sex tries to be selected the other
intrasexual selection is between a sex and is how one member ensures they are picked over another
Explain intersexual selection
- Describes the strategies each sex uses to attract the other
- Quality over quantity and is hence preferred by females as they invest more into an ova and have more responsibility for the child
- Female is hence more choosy due to limited reproductive resources so enables high quality of offspring
Explain intrasexual selection
- Describes the straggles used within sexes to ensure being picked
- Quantity over quality approach preferred by males as they produce continuous gametes so is effective to impregnate as many females as possible to ensure passing on their genes
What is the sexy sons hypothesis?
- Coined by Fisher (1930)
- A female mates with a male who has a desirable characteristic to ensure sexy trait inherited by son
- Increases chance of successive generations of females mating with the offspring
- Example of intersexual selection
AO3: What is the research support for preferences being related to anisogamy?
- Buss (1989) carried out a survey of over 10,000 adults in 33 countries
- Asked Q’s about age and attributes that evolution says should be important
- Female respondents placed greater value on resource related characteristics and males on good looks and chastity
- Reflect sex differences in mate strategies due to anisogamy and hence support sexual selection theory
AO3: Why is there evidence to suggest it is incorrect that todays reproductive patterns have strong evolutionary basis’?
- Interactionist more likely
- Culture and evolution both have a role Chang (2011)
- Changing social and cultural norms mean women no longer place a large emphasis on resource (Bereczkei 1997) as are now more financially independent
- Some evolutionary pressures no longer apply
AO3: What is the evidence for sexual selection pressures continuing into modern times?
- Singh (1993)
- Hip to waist ratio of 0.7 demonstrates fertility and child bearing abilities and hence preferred by males
- Honest signal that is hard to fake but shows women is also not pregnant
- Some evolutionary pressures still exist today
AO3: What is the research support for intersexual selection?
- Greater energy input from females
- Clark and Hatfield (1989) showed female choosiness is a reality
- Male and female students on campus asked other students to sleep with them
- No female said yes, whereas 75% of men said yes
- Supports evolutionary basis as says females are choosier and males evolved differently
Define self-disclosure
Revealing personal information about yourself. Romantic partners reveal more about their true selves as their relationship develops. These self-disclosures of deep thoughts and feelings can supposedly strengthen a romantic bond when used appropriately
What is the place of self-disclosure in social penetration theory?
- Altman and Taylor (1973) of how a relationship develops
- Self disclosure in a relationship involves the reciprocating of deep thoughts and feelings
- When someone reveals information, it displays trust and the other partner must reciprocate and hence penetrate more deeply into each others lives
- However, it is important to choose what to disclose and when
Explain the breadth and depth concept of self-disclosure
- Second element of Altman and Taylor (1973)
- Onion analogy used to illustrate this. A relationship progresses and more layers of the onion are removed (we disclose lots of low risk info but superficially at the beginning)
- As the relationship progresses, self disclosure becomes deeper and more high risk information is revealed such as painful memories and strong beliefs