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increases in relation to face area



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increases in relation to face area.
2. Using item 6 of your data, describe the general change in cranial capacity seen in the three

animals studied. Cranial capacity increases in going from gorilla to Australopithecus to



human.
3. Using items 7 and 8 or your data, describe the general change in jaw angle and prognathism (how

far the jaw protrudes forward) in the three animals studied. Jaw angle increases in going from



gorilla to Australopithecus to human. Prognathism decreases in going from gorilla to

Australopithecus to human
4. Using items 9 and 10 of your data, describe the general change in brow ridge and sagittal crest in

the three animals studied. Brow ridge and sagittal crest are present in both gorilla and



Australopithecus but both are absent in the human. Brow ridge and sagittal crest were both

more prominent in gorilla than Australopithecus.
5. Using items 11-17 of your data, describe the general change in teeth number, size, and diastema

in the three animals studied. Teeth number and types of teeth are identical in all three skulls.



The relative size of the teeth are close in Australopithecus and human, while the canine

teeth are overly large in the gorilla. The gorilla also exhibits diastema while the gorilla and

Australopithecus do not.
6. Using items 18-22 of your data, describe the general change in lower jaw shape in the three

animals studied. The jaw of the gorilla is U-shaped while the jaw of Australopithecus and



human are V-shaped.
7. Using items 23 and 24 of your data, decide if Australopithecus was quadrupedal or bipedal. (The

gorilla pelvis shape aids in its “walking on all fours,” which is quadrupedal. The human pelvis

shape aids in its walking on two legs, which is bipedal.) Bipedal.
8. How many traits are similar when comparing (Use the 24 on the data table)


  1. gorilla to Australopithecus? 10




  1. Australopithecus to modern human? 16




  1. Gorilla to modern human? 5

9. Based on your answer to question 8, does a modern human seem to be closer in evolutionary



development to gorilla or Australopithecus? Australopithecus


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