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Chapter 17: Human Mate Choice and Parenting. Mate Choice (already covered) Child Abuse and Infanticide Focus of lecture materials Child spacing !Kung demands of motherhood. Kin-Selection and Child Abuse/Infanticide. Kin-Selection: is this child mine?
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Chapter 17: Human Mate Choice and Parenting • Mate Choice (already covered) • Child Abuse and Infanticide • Focus of lecture materials • Child spacing • !Kung demands of motherhood
Kin-Selection and Child Abuse/Infanticide • Kin-Selection: is this child mine? • For women, (apart from adoption) a child is always related to her by .5 • For men, a child is also related by .5 if he has high paternal certainty • Prediction: biological parents are more likely to feel more motivation to care for their children that will stepparents or other substitute caregivers. • Figures in Homicide pgs 86 & 87 • Ibid pgs 90, 91 &92
Who does the killing? • Webster’s unabridged dictionary defines “stepmother” as: • The wife of one’s father by a subsequent marriage. • One that fails to give proper care or attention. • Sex differences in infanticide and age of child • Ibid 81
Evolutionary theory predicts that among biological parents, infanticide is more likely to be committed by young unmarried women when the baby is in the first year of life. • Children sleeping in parents bed • Postpartum depression
Child Spacing • Optimizing logic • Lack’s optimal clutch size • !Kung Mothers space their children according to their work loads
Work Load by IBI (child spacing) Optimal IBI is 4 years and the average actual IBI is 4 years