4. As defined above, is a crown group monophyletic? Is a stem group monophyletic?

Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter24: Systematics And Phylogenetics: Revealing The Tree Of Life
Section: Chapter Questions
Problem 3TYK: Which of the following does not help systematists determine whether a morphological character state...
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4. As defined above, is a crown group monophyletic? Is a stem group
monophyletic?
It is sometimes useful to think in terms of stem groups and crown groups because it
helps us to place extinct taxa in their appropriate evolutionary context without having to
"force" them into a box (e.g., bird-like reptiles do not have to be classified as birds, per
se). And so, when we discuss extinct taxa in this course, we will sometimes refer to
them as being part of a stem group.
Transcribed Image Text:4. As defined above, is a crown group monophyletic? Is a stem group monophyletic? It is sometimes useful to think in terms of stem groups and crown groups because it helps us to place extinct taxa in their appropriate evolutionary context without having to "force" them into a box (e.g., bird-like reptiles do not have to be classified as birds, per se). And so, when we discuss extinct taxa in this course, we will sometimes refer to them as being part of a stem group.
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