IB35ACS Study Guide

Hormone prolactin produced in anterior pituitary o

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Unformatted text preview: today) “pair- bonding” transition o ovulation in other mammals o estrus o life histories of other apes ▪ Sexual maturity: gorillas, orangutans, chimps (6.5- 11.5 years) ▪ Theoretical TFR: orangutans, chimps, gorillas (by least to most) o Ardipithecus ▪ small canines ▪ Bipedalism ▪ Pairbonding results in more provisioning & additional parental care ▪ Interpretation: they lacked visual cues as to when a female is ovulating ▪ How could all of this have affected the IBI? “helpless baby” transtion o secondary altriciality (brain keeps growing well after birth) o the obstetrical dilemma: conflicting trends: transition to walking upright, bipedal, required a decreased size of the bony birth- canal but the trend toward increased intelligence required a larger cranium, which would need a wider obstetrical pelvic area. o Homo erectus: KNM WT 15000 (West Lake Turkana, Kenya) ▪ 200cc (birth), 700cc (1 year), 900cc (adult) compared to humans 380cc, 1000cc, 1400cc Neolithic transition o Shift from hunting- gathering to agriculture o 11,000- 3,000 years ago o made possible the establishment of a non- food- producing sector o agriculture now represents only 3% of US labor force o changes in the demographics ▪ pop size increased: 6 million to 7 billion, TFRs higher in ag groups ▪ health of hunter- gatherers was better than that of neighbor farmers (osteological evidence), increase in juvenile skeletons (...
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