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

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

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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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
Transcribed Image Text: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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