Human Evolution
Autor: Thông Hoàng • October 27, 2017 • Lab Report • 1,232 Words (5 Pages) • 780 Views
Human Evolution
By: Hoang Thong Summat (Jason )
Lab partner: Abdul Rehman
Introduction
Please see week 13 on moodle
Aim: To investigate the evolution of the human species.
Method:
Please see week 13 on moodle
Analysis Question
Part A
Comparison of a gorilla skull and a modern human skull.
Q1. The common ancestor for the gorillas and humans existed in between 8 and 10 million years ago
Q2. Complete this table. The first structure has been completed for you.
Feature to observe | Gorila | Human |
Forehead (G1 and H1) | Forehead slopes backwards | High forehead(vertical) |
Brow ridge (G2 and H2) | Large and heavy | Small or absent |
Size of brain case in comparison to rest of skull (G3 and H3) | Smaller in size compared to human | Increase to be much larger compared to other species. |
Slope on face (G4 and H4) | Slops backward | Vertical |
Size and shape of teeth (G5 and H5) | Large canine and molar | Small canine and molar |
Size of zygomatic arch (G6 and H6) | Large | Small |
Size of lower jaw (G7 and H7) | Large | Shallow and slight |
Presence or absence of sagittal crest (G8 and H8) | Present | Absent |
Q3.
The teeth and the lower jaw of gorillas is larger compared to human. This indicates their eating habits and the way they eat.
For gorillas, they are more likely to have vegetarian diet, they eat stems, bamboo shoots and fruit which is much tougher so their canine and molar increase to be larger in size. Moreover, they need strength to chew on those tough food and therefore their jaw becomes larger to consume more energy to chew.
For human, we only eat soft food which is already processed so our teeth decrease in size to have a small and uniform shape. Furthermore, we need less strength to chew on food compared to the gorillas and therefore our jaw becomes smaller.
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