Lecture 25 (4-19) - Evolution of the Human Life Cycle Life...

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Evolution of the Human Life Cycle Life history theory Series of energetic trade-offs among traits Traits: Length of gestation Length of childhood growth period Adult body size Age at reproductive maturity lifespan The Human Life Cycle 1. Prenatal begins with conception and ends with birth. 2. Infancy is when the baby nurses. 3. Childhood is from weaning to puberty. 4. Adolescence is from puberty to the end of growth. 5. Adulthood is the completion of growth. Biocultural Evolution Natural selection operated on life history traits Selective pressures unique to our evolution Hominins generally (bipeds) Genus Homo specifically Selective pressures Trade-off between mother’s pelvis size and infant’s head diameter Bipedalism may have required more brain development outside the womb Evolution of Human Brain Size and Life Cycles Humans are an altricial species Delayed maturation – brain development outside the womb Infant dependency period
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This note was uploaded on 04/02/2008 for the course ANTHRO 1 taught by Professor Wilkie during the Spring '08 term at University of California, Berkeley.

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Lecture 25 (4-19) - Evolution of the Human Life Cycle Life...

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