Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN:9781337408332
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Chapter25: Animal Evolution-the Chordates
Section: Chapter Questions
Problem 5SQ: Tetra pods evolved from ___ . a. sharks b. teleosts c. lobe-finned fishes d. placoderms
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A 2015 article in Nature has summarized the early history of jawed vertebrates using highlights from recent discoveries and how they have changed our understanding of vertebrate evolution.
https://www.sciencedaily.com/releases/2014/04/140416133336.htm
Question: Given these recent discoveries, how should the cladogram below change? Describe it. It will likely be helpful to reference a synapomorphy noted on the cladogram.
Expert Solution
Step 1
- A cladogram is a diagram used to represent a hypothetical relationship between groups of animals, called a phylogeny
- cladograms reconstruct the evolutionary history. (phylogeny) of the taxa.
- Synapomorphies are characters shared by a group of taxa due to inheritance from a common ancestor. Thus, their depiction on a cladogram may facilitate the understanding of evolutionary relationships.
- The lines represent evolutionary time, or a series of organisms that lead to the population it connects to.
- Nodes represent common ancestors between species . At some point in the past a population of common ancestor organisms was divided, giving rise to the different organisms being studied.
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