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Lecture 13

PSYC 3100 Lecture Notes - Lecture 13: Red Queen Hypothesis, Major Histocompatibility Complex, Genetic Load


Department
Psychology
Course Code
PSYC 3100
Professor
Pat Barclay
Lecture
13

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Outline Lecture 13 Mating 2
1. Why Sexual Reproduction?
- Red Queen Hypothesis: sexual reproduction to “outrun” parasites & pathogens
2. Adaptations for perceiving things as beautiful
- Why be attracted to anything?
- Direct & indirect benefits for mating with specific individuals
3. Choosing compatible genes
- Preference for MHC dissimilarity (Major Histocompatibility Complex)
4. Influence of pathogens & parasites
- Cues of health
- The impact of pathogens on polygyny
5. How to detect quality?
- Cues & indicators (e.g. symmetry)
- Costly signals (e.g. testosterone)
- Preferences for these traits increasing while ovulating
If we have time:
6. How do these traits interact? Integrating different cues for different goals
7. Mate Choice Copying: imitating the choices of others who may have info you don’t have
8. Changes in female appearance and behaviour during ovulation
9. Altruism & attractiveness: do women really prefer “bad boys”, all else being equal? (If you’re
interested in the topic, this article is also posted on my door and my website.)
1. why is there sexual reproduction? Why does any species reproduce sexually?
-many species can reproduce asexually (plants, animals)
-there are costs of sexual reproduction:
-only pass on half of ones DNA
-mate search and competition
-STDs
-what advantages could outweigh the costs of sexual reproduction?
Coevolution Hypothesis (a.k.a The Red Queen Hypothesis): create diverse
offspring to cope with an unpredictable biotic environment (e.g, parasites,
diseases, predators) (parasites can evolve much faster to get past a hots' immune
system, because these evolve so fast there must be another way to fight them off.
“here, you see, it takes all the running you can do just to stay in the same place”
Must keep co-evolving to stay ahead of the pathogens and parasites. If we stop
running, they will take over because they've adapted to our immune system)
-function of sexual reproduction arises from a need to adapt to pathogens &
parasites
2. Physical attractiveness: Are Perceptions of Beauty Arbitrary?
-why are some individuals considered more attractive than others? Why be attracted to
anything?
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