The common ancestor that produced the most evolutionary recent derived characters is
A. 12
B. 9
C. 8
D. 6
Clarify Question
1. What is the key concept addressed by the question?
2. What type of thinking is required?
3. What key words does the question contain and what do they mean?
Gather Content
1. What do you know about relatedness based on a phylogenetic tree?How does it relate to the question?
Consider Possibilities
1. What other information is related to the question? Which information is most useful?
2. Which lines are the shortest?
Choose Answer
1. Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
1. Did your problem-solving process lead you to the correct answer? If not, where did the process
break down or lead you astray? How can you revise your approach to produce a more desirable result?
D. 6
Clarify Question
1. The question is about interpreting phylogenetic trees.
2. This question is asking for you to apply the principles of a
phylogenetic tree to infer relatedness.
3. evolutionary recent derived characters– this refers to traits that related species have. Evolutionary recent means that they happened more recently that other shared traits.
Gather Content
1. The Y axis measures time, the longer the line, the more time since the living species at the end of either branch shared a common ancestor. The nodes or branchpoints refer to recent common ancestors.
Consider Possibilities
1. The other pairs of species all have more distant common
ancestors based on the lengths of the lines.
2. The lines between species R and D and their most recent common ancestor are the shortest and occurred most recently.
Choose Answer
1. R and D have the most recent common ancestor and this ancestor is indicated by branchpoint 6.
Reflect on Process
1. This question asked you to apply your understanding of a phylogenetic tree to determine recent ancestors.If you got the correct answer, great job! If you got an incorrect answer, where did you get stuck? Did you realize that the Y axis (vertical) represents time and the numbers at the branch points represent common ancestors?
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