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Lab4_BipedalorNot.docx

Lab 4: Bipedal or Not?

INTRODUCTION

You’ve learned some of the physical characteristics that show whether an individual was a habitual or obligate biped. In this assignment, you’ll examine fossils and apply your knowledge to determine whether the individual walked on two legs or four.

INSTRUCTIONS

For each image below, determine whether the individual was bipedal or not, and explain your reasoning.

QUESTIONS

Question 1

Look at the cranium below. You do not need to know the species.

inferior view of cranium with foramen magnum positioned in the center

Based on your observation, was this individual bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 1A HERE.

How do you know whether this individual was bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 1B HERE. (1 sentence)

Question 2

Look at the cranium below. You do not need to know the species.

inferior view of cranium with foramen magnum positioned at the back

Based on your observation, was this individual bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 2A HERE.

How do you know whether this individual was bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 2B HERE. (1 sentence)

Question 3

Look at the sacrum below. You do not need to know the species.

sacrum that is long and thin

Based on your observation, was this individual bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 3A HERE.

How do you know whether this individual was bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 3B HERE. (1 sentence)

Question 4

Look at the sacrum below. You do not need to know the species.

sacrum that is short and wide

Based on your observation, was this individual bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 4A HERE.

How do you know whether this individual was bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 4B HERE. (1 sentence)

Question 5

Look at the femur below. You do not need to know the species.

femur that is short and straight

Based on your observation, was this individual bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 5A HERE.

How do you know whether this individual was bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 5B HERE. (1 sentence)

Question 6

Look at the femur below. You do not need to know the species.

femur that is long and angled

Based on your observation, was this individual bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 6A HERE.

How do you know whether this individual was bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 6B HERE. (1 sentence)

Question 7

Look at the articulated foot below. You do not need to know the species.

skeletal foot with all toes aligned

Based on your observation, was this individual bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 7A HERE.

How do you know whether this individual was bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 7B HERE. (1 sentence)

Question 8

Look at the articulated foot below. You do not need to know the species.

skeletal foot with angled big toe

Based on your observation, was this individual bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 8A HERE.

How do you know whether this individual was bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 8B HERE. (1 sentence)

Question 9

Look at the os coxa below. You do not need to know the species.

os coxa that is short and wide

Based on your observation, was this individual bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 9A HERE.

How do you know whether this individual was bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 9B HERE. (1 sentence)

Question 10

Look at the os coxae below. You do not need to know the species.

os coxae that are narrow and long

Based on your observation, was this individual bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 10A HERE.

How do you know whether this individual was bipedal or not?

TYPE YOUR RESPONSE TO QUESTION 10B HERE. (1 sentence)

You’re finished!

GRADING

Points

Descriptors

5 points each

Did you correctly identify whether the individual was bipedal or not?

5 points each

Did you accurately describe why you reached your decision?

Image sources:

Photos for questions 1 and 6: efossils.org

Photos for Questions 2, 3, 4, 5, 7, 8, 9 and 10: eskeletons.org

All images used under Creative Commons 2.0 license.