Love Flashcards

1
Q

Rareness of Monogamy

A
  • 90% of birds
  • 3% of mammals
  • 27% of primates
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2
Q

Cost and Benefits of Monogamy

A

benefit: co-parenting increases odds of offspring survival, female protection

cost: decreased opportunity to spread genetic material, challenges of mate-guarding

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3
Q

Reasons for Monogamy in Primates

A
  • possibly for biparental care
  • mate-guarding in males that increases confidence in offspring paternity
  • risk of infanticide
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4
Q

Human Design for Monogamy

A

Testes Size: in primates there is increased sperm competition therefore men adapt

Evolutionary Adaptations:
- penis as a sperm displacement device
- increased sperm count in couples that spend less time together

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5
Q

Clues for Male Monogamy from Sexual Dimorphism

A
  • fertile all the time
  • in monogamous species males and females are more physically similar
  • decreased competition between males for mates lessens the need for competitive features
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6
Q

pair-living

A

two adults and non-reproductive offspring sharing a home range, still with extra-pair mating

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7
Q

pair-bonding

A

long-term social relationship between two individuals

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8
Q

monogamy

A

mating and breeding system with sexual exclusivity

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9
Q

Prairie Voles and the Monogamous Brain

A
  • higher release of oxytocin and vasopressin during mating, regulating pleasure centre of female brain, associating happy experience with vole they are with
  • compared to Montane vole that show less activation of these hormones during sexual activity
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