Name: _________________________________________________
Date: _________________________
SBI3U1: Phylogenetic Trees Worksheet
/28 marks
1. Answer the questions below based on the following phylogenetic tree.
a. Give an example of two organisms which are most closely related. State the number of ancestral links they
have in common.
[2 marks]
b. Which organism shares the fewest ancestral links with the other organisms? How do you know?
[2 marks]
c. Draw a clade around organisms that share at least two (2) ancestral links.
[1 mark]
d. Is the hen or the frog more related to the rat? Or are do they both share the same level of ancestry? Explain
your response.
[3 marks]
2. Answer the questions below based on the following phylogenetic tree.
a. Give an example of two organisms which are most closely related. State the number of ancestral links they
have in common.
[2 marks]
b. Which organism shares the fewest ancestral links with the other organisms? How do you know?
[2 marks]
c. Draw a clade around organisms that share at least three (3) ancestral links.
[1 mark]
d. Choose any two organisms that share at least 3 ancestral links. Research common characteristics they share in
common (provide at least 3 common traits).
[3 marks]
3. Answer the questions below, based on the following chart.
a. What is one example of two organisms which are most closely related? Give your reasoning for your response.
[3 marks]
b. Which organism is least related to all the other organisms? Give your reasoning for your response.
[3 marks]
c. Choose two organisms which are closely related (not your answer to question “a”) and discuss how their
physical/chemical features make them share common ancestry. Hint: You will have to research the organism’s taxon
to determine what each indicates.
[6 marks]