BIO 1M03 Test 2 Questions With Verified Answers

Angiosperm - Answer -flowering plant -has seeds with casing -has endosperm in seeds -fruit -most diverse Radiometric methods of dating - Answer -K/Ar (lava, 500K+ years) -C14 (conversion to N14, 40K yrs) -Thermoluminescence (burning) -Electron spin (teeth) -Uranium Lead (mineral deposits) Relative methods of dating - Answer -magnetic reversals -extinct and distinct species Primate - Answer -climbing/locomotion adaptations -big brain -opposable thumbs and prehensile tails -nails Prosimians - Answer -strepsirrhines -small brain -big eyes -nocturnal Tarsiers - Answer -big eyes -good hearing NWMs - Answer -plattyrhines -prehensile tails -no opposable thumbs -monogamous OWMs/apes - Answer -catarrhines -opposable thumbs -big brains -diurnal -non monogamous Middle Eocene - Answer 54-34mya -primates dispersed across the Atlantic ocean Teeth - Answer -reflect dietary specialization -frugivore: small molars, large incisors -insectivore: sharp incisors -folivore: thick enamel Apes - Answer -Hominoids -gibbons, orangutans, gorillas, chimps, humans -some OWM that sit on branches have ischial callosities -long arms -short legs Flow of primates - Answer Africa--SE Asia--Africa Origin of violence - Answer -Gibbons: monogamous -Orangutans: solitary, bimaturation, forced copulation -Gorillas: infanticide, harems -Chimps: raids, male dominated -Bonobos: lots of sex, female dominated Theories of bipedalism - Answer -keeps you cooler -hands free -increased dependence of children Late Miocene/Pleiocene - Answer -global cooling -hominins moved to grasslands Chimp human split - Answer 5-7mya -4 to 2 legs -S shaped spine -foramen magnum centred -longer legs -flatter/flared pelvis -hip abductors -narrow foot with big toe Human/chimp MRCA - Answer 5-7mya -3 fossils -ancestral: thick enamel, big brain -derived: shorter arms, upright, less prognathism Hominins 4-6mya - Answer -ancestral: small molars, thin enamel, large canine, large brow -derived: forward foramen magnum, small canines, flatter face, pelvis Hominins 2-4mya - Answer -4-7 lineages in africa for 2mya -australopithecus: small teeth -paranthropus: big teeth -kenyanthropus: flat face and small teeth