Family and Kinship Ian Mcglaze, Jennifer Buckentine, Jessica Ando Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping,

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Presentation transcript:

Family and Kinship Ian Mcglaze, Jennifer Buckentine, Jessica Ando Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Panel Video nRP5o nRP5o exiiPE exiiPE Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Boy or Girl? What Influences the Sex of Your Child? Sex ratio varies slightly in in different circumstances, but in general evolution helps pass on genes efficiently. Normal sex ratio: 105 boys for every 100 girls Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Trivers-Willard Hypothesis Wealthy parents of high status have more sons and poor parents of low status have more daughters Sons and daughters from wealthy families Sons and daughters from poor families Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Boy or Girl? What Influences the Sex of Your Child? Generalized Trivers-Willard Hypothesis: If parents have any trait they could pass on to their children that is better for sons than for daughters, then they will have more boys and vice versa. Among engineers and systemizers the sex ratio is 140 boys to 100 girls. Among nurses and empathizers, 140 girls for every 100 boys. Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Why Beautiful People Have More Daughters Beautiful women have greater success in long term and short term mating, but handsome men have greater success in only short term mating. Hypothesis: physically attractive parents should have more daughters than sons. Being attractive increases the odds of having a daughter by 36% Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Women are More Beautiful Than Men Women will become more attractive on average than men over time. Women are more beautiful than men because beautiful parents have more daughters than sons. Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Why Do Girls of Divorced Parents Experience Puberty Early? Girls whose parents divorce before age 5 generally experience puberty earlier than girls whose parents stay married. Early sexual experience High number of sexual partners Teen pregnancy Divorce in first marriage Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Why Do Girls of Divorced Parents Experience Puberty Early? Two competing explanations 1. Girls who experience puberty early have different genetic makeup than girls who do not. 2. Girls have similar genetic makeup but respond to the environment differently. Main point: girls who grow up without a father learn that men do not form lasting relationships or invest in their offspring. Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Critique 1. Why girls of divorced parents go through puberty early was confusing and wordy. 2. Possible evolutionary explanation was not addressed. 3. Lack of evidence of Trivers-Willard Hypothesis. 4. Sons from poor families are not desirable?! Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Interesting Points 1. Early onset of puberty for girls of divorced parents. 2. Extended Trivers-Willard Hypothesis 3. Study of sex ratio Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Test Questions Conceiving a boy is entirely up to chance? T/F According to the Extended Trivers- Willard Hypothesis, Kobe Bryant is likely to have a ________? Physical attractiveness contributes more to men or women’s reproductive success? Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Test Questions Physical attractiveness increases the odds of having a daughter by: ◦ A. 32% ◦ B. 33% ◦ C. 35% ◦ D. 36% ◦ E. Y = mx + b Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Test Questions According to our study, males from poor families will: ◦ A. Have high mating success ◦ B. Have moderate short term mating success ◦ C. Have low mating success ◦ D. “ be completely excluded from the reproductive game, because NO women would choose them as their mate” Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.

Last Test Question! Girls from divorced parents will tend to: ◦ A. Be more promiscuous ◦ B. Have sex at an early age ◦ C. Get divorced in their first marriage ◦ D. All of the above Miller, A.S. & Kanazawa, S. (2007). Why Beautiful People Have More Daughters: From Dating,Shopping, and Praying to Going to War and Becoming a Billionaire—Two Evolutionary Psychologists Explain Why We Do What We Do. (pp ) New York City: NY: Perigee Inc.