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Aps Vs Modern Apes Essay

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1.The ancestral characteristics of the species are flat face with forward facing eyes and molars present because they all contain these features. Sagittal crest, large cranium , similar width of dental arcade to the length, chain and supraorbital bow are derived characteristics because they are specific to all hominins and are not found from their ancestor.

2. It can be concluded that both hominins and modern apes share flat face with forward facing eyes and molars present. The Phylogenetic Tree shows that the modern apes diverged from hominins. This implies that modern apes and hominins share a same ancestor, but early hominins did not evolve from modern apes. The closest relative of human (Homo sapiens) is Homo neanderthalensis. We share many characteristics, such as chain, large cranium and similar width of dental arcade to the length. One of differences is Homo neanderthalensis has Supraorbital bow, not human does not. …show more content…

The skull proportion index conveys the proportional relationship between the face and the cranium. A larger index indicates a larger cranium in comparison to the face. The skull proportions of Homo sapiens, Homo neanderthalensis, and Homo erectus are relatively large, which are around 100. This suggests that Homos have large brain and cranium. Brain is associated with intelligence. Hence, homo can perform more complex activities, such as using sophisticated stone tools, cooking, and mashing food. Meanwhile, the skull proportions of Australopithecus afarensis and Paranthropus boisei are relative small. This suggests that Australopithecus afarensis and Paranthropus boisei have small brain and cranium. They can perform relatively simple activities, such as using basic stone tools, instead of sophisticated stone

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