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MERLOT II


    

Peer Review


Phylogenetic Trees Animation

by Peter Raven
 

Ratings

Overall Rating:

4.75 stars
Content Quality: 4.5 stars
Effectiveness: 5 stars
Ease of Use: 4.75 stars
Reviewed: Feb 13, 2014 by Biology Editorial Board
Overview: This resource describes the phylogenetic tree and how it represents interrelatedness of species descended from a common ancestor. The narrated animation defines the basic vocabulary and illustrates the concepts with simple diagram and animation and explains how to read or interpret a phylogenetic tree.
Learning Goals: None specifically stated, but this resource is part of the materials for Chapter 21 of the Raven Biology text, which has learning goals. Several of the goals apply to the animation. Users will learn:
  • How to read or interpret a phylogenetic tree
  • Definitions of terms associated with reading and constructing cladograms and phylogenetic trees
Target Student Population: High school or lower division biology students.
Prerequisite Knowledge or Skills: There are no prerequisites for this site although some knowledge of basic biology will help in understanding what is presented.
Type of Material: Animation with narration.
Recommended Uses: Homework, lecture and lab supplement.
Technical Requirements: Web browser with Adobe Flash.

Evaluation and Observation

Content Quality

Rating: 4.5 stars
Strengths:
  • All information is accurate
  • The level is very basic and so this would be useful to students with no background in biology or evolution
  • The sequence of topic presentation is logical and well-organized • The narration is clearly enunciated
  • some good examples given
Concerns:
  • The description of what a tree is, is very rudimentary and could be expanded for students who have no idea how to interpret trees
  • No explanation of how trees are created is given
  • No indication that multiple trees are possible is given, when the animation discusses how to determine the likelihood that a tree is accurate

Potential Effectiveness as a Teaching Tool

Rating: 5 stars
Strengths:
  • This animation could serve as an introduction to a more detailed explanation of evolutionary trees
  • The blend of text, audio, and images makes the material interesting
  • The material is visual and so is effective and engaging
Concerns:
  • None

Ease of Use for Both Students and Faculty

Rating: 4.75 stars
Strengths:
  • The controls are easy to use and work on both Mac and PC
  • Information is well organized and easy to understand
  • There is way to toggle text and audio so users can either one or both
  • The pause button and slider make it easy to navigate
Concerns:
  • There is no full screen function. Having this feature would make the animation more useful for instructors to use in class

Other Issues and Comments: This animation is a very basic introduction to phylogenetic trees. As such, it leaves out most of the details and nuances of interpreting trees. However, students have a typical series of misunderstandings about how to interpret these visual representations of evolution. The animation could address a few of these rather easily. For example a time axis on the first tree would be helpful, as would a slightly more detailed explanation of what "the branches connect the common ancestors" means. Trees are never described as hypotheses of relationships, to be tested by the evidence, but rather as constructs based on identifying synapomorphies accurately, (which is the reverse of how trees are constucted). The discussion at the end of eukaryote relationships and the demise of protista is confusing.