Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 21.1, Problem 3R
Summary Introduction
To review:
The reasons that explain that the distantly related species might also have similar traits with the help of examples and the method used by the biologists to reconstruct phylogenies while considering these homoplasies.
Introduction:
After the continental drift that resulted in the fragmentation of Gondwana land, most of Eurasia separated from Australia and Africa. The mass extinction events at the end of the Cretaceous period and the continental drift lead to the diversification of the species, as a result of which the analogous traits developed in the distantly related species.
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Students have asked these similar questions
Below are phylogenetic trees depicting the relationships among four species, A, B, C, and D. Which of the following statements is correct?
Tree (1) and Tree (2) are the same tree.
Tree (2) and Tree (4) are the same tree.
Tree (2) and Tree (3) are the same tree.
All four trees are in fact the same tree.
All four trees are in fact different trees.
What is phyletic speciation? What is divergent speciation?
In a phylogenetic tree, Species 1 and 2 are distantly related to one another but are both darkly pigmented. Species 3 which is unpigmented is a sister taxon to Species 2. The common ancestor to all three species is darkly pigmented; thus, this trait in the phylogeny is considered to be a -
A. homoplasy.
B. synapomorphy.
C. apomorphy.
D. symplesiomorphy.
Chapter 21 Solutions
Life: The Science of Biology
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