3. Which of the following phylogenies is different from the other three?B DECGA FaFFdB'FAG CEDBOne additional concept that will likely be unfamiliar to many of you is that of crown vs.stem groups. As their names imply, crown groups are clustered toward the tips of aphylogeny, while stem groups are clustered toward the bottom of a phylogeny. This is ageneral pattern and not a fixed and precise rule, however, as both extinct and extantgroups can be part of the "crown" group. The deciding factor that determines thedelineations of a crown vs. stem group is whether the synapomorphies that define thegroup under examination are present. For example, you could have a whole cluster ofmammals, some of which are extinct, but all of which show all of the characteristicscurrently used to define mammals. In this case, any extinct groups that show allmammalian features would be classed as crown mammals. In contrast, any extinctgroups that branch off on the way to mammals, but did not possess all mammalian

A phylogenetic tree is a branching diagram or a tree showing the evolutionary relationships among…

Answered: 3. Which of the following phylogenies…

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Biology

3. Which of the following phylogenies is different from the other three? B B DECGA F E G A a -F

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 12TYK

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Concept explainers

Animal Phylogeny

Cladistics is a method of biological classification where organisms are classified based on their ancestors and their relationship with them. It is defined as the concepts and methods for determining the branching patterns of evolution and evolutionary history. Some scientists, however, have preferred the term phylogenetic systematics or phylogenetic taxonomy to emphasize the reliance on a phylogeny for classification. It is the most common and accepted method for classifying organisms.

Question

3. Which of the following phylogenies is different from the other three?
B DECGA F
a
F
F
d
B'
FAG CEDB
One additional concept that will likely be unfamiliar to many of you is that of crown vs.
stem groups. As their names imply, crown groups are clustered toward the tips of a
phylogeny, while stem groups are clustered toward the bottom of a phylogeny. This is a
general pattern and not a fixed and precise rule, however, as both extinct and extant
groups can be part of the "crown" group. The deciding factor that determines the
delineations of a crown vs. stem group is whether the synapomorphies that define the
group under examination are present. For example, you could have a whole cluster of
mammals, some of which are extinct, but all of which show all of the characteristics
currently used to define mammals. In this case, any extinct groups that show all
mammalian features would be classed as crown mammals. In contrast, any extinct
groups that branch off on the way to mammals, but did not possess all mammalian

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