What Is Life? A Guide to Biology with Physiology
4th Edition
ISBN: 9781319065447
Author: Jay Phelan
Publisher: W. H. Freeman
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Chapter 12, Problem 5MC
Summary Introduction
Introduction:
Similarities and differences between organisms can be used to guess how closely they are related.
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To apply parsimony to constructing a phylogenetic tree, (A) choose the tree that assumes all evolutionary changes are equally probable. (B) choose the tree in which the branch points are based on as many shared derived characters as possible. (C) choose the tree that represents the fewest evolutionary changes,in either DNA sequences or morphology. (D) choose the tree with the fewest branch points.
Which of the following is TRUE about a phylogenetic tree?
It provides a drawing the reflects the proven relationships between living and extinct species.
b
It provides a hypothetical model of the relationships between extinct species.
c
It provides a hypothetical model of the relationships between living and extinct species.
d
It a diagram used by scientists that provides a model of evolutionary relationships without the need for scientific data.
The number of possible trees resulting from phylogenetic analysis grows exponentially with the number taxa, such that in a 22 taxon analysis there are more possible unrooted trees than there are stars in the universe.
A) True
B) False
C) It depends on the inference method and optimality criteria used.
D) Number of taxa and number of unrooted tree possibilities are unrelated in phylogenetic analysis.
Chapter 12 Solutions
What Is Life? A Guide to Biology with Physiology
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- A phylogenetic tree is different from a cladogram in that ... Group of answer choices A: it shows that all species are not related to a common ancestor, but each has a distinct archetype. B: it represents the time scale of evolution, including where extinct species fit in. C: it uses an outgroup to compare a small group of species that exhibit similar traits D: it is not based on genetic or morphological evidence.arrow_forwardPhylogenetic trees are based on a. natural selection. b. genetic drift. c. homology. d. none of the above.arrow_forwardPhylogenetic trees are constructed based on Group of answer choices a. shared ancestral characters b. vestigial characters c. homoplastic characters d. cartoon characters e. shared derived characters f. shady charactersarrow_forward
- What is the phylogenetic definition of a species? A) A group of individuals that can breed and produce viable offspring B) A group of interbreeding individuals that share the same environment C) A group of individuals that share a common ancestorarrow_forwardWhat problems does horizontal gene transfer cause for evolutionary biologists? a. It can make the reconstruction of phylogenetic trees difficult because it can obscure phylogenetic relationships. b. It can cause physiological problems in some organisms, making it hard to study them. c. It can make breeding between different individuals of the same species difficult. d. Because it is the transfer of genes between the same species, it can make individuals look more similar than they actually are. e. All of the above.arrow_forwarda) What is a phylogenetic tree? b) What is a branch point? c) What are sister taxa? d) What is a ‘rooted’ phylogenetic tree?arrow_forward
- Which of the following best explains why coalescent-based phylogenetic inference is important in the age of phylogenomics? A) Coalescent-based methods directly model gene tree histories independently to infer the species tree in a summary-based manner, which is important for phylogenomic analysis were hundreds to thousands of gene histories are analyzed. B) Coalescent-based methods have the most advanced evolutionary models of molecular evolution, which is important for phylogenomic analysis were hundreds to thousands of gene histories are analyzed. C) Coalescent-based methods are no more important than other types of phylogenetic inference, even for phylogenomic analyses. D) None of the above.arrow_forwardA good “phylogenetic” species is one that is A. The smallest diagnosable cluster of organisms within which there is a pattern of ancestry and descent B. The most inclusive population of individuals having the potential for phenotypic cohesion through intrinsic cohesion mechanisms. C. Morphologically distinctive from other groups of organisms D. An actually or potentially interbreeding group that is reproductively isolated from other such groups.arrow_forwardWhich method of building phylogenetic trees relies on both the number of evolutionary transitions on the phylogenetic tree and the likelihood of the evolutionary transitions? a. Maximum Credibility b. Maximum Likelihood c. Parsimony d. Bootstrappingarrow_forward
- Discuss how the principle of parsimony can be used in a cladistics approach to constructing a phylogenetic tree.arrow_forwardWhich statement is usually true about phylogenetic trees? a) nodes represent points when traits have evolved b) branch tips that are next to each other are more closely related c) the branching pattern describes the hypothesized evolutionary relationships between the taxa d) the order of the branch tips (left to right) indicates which taxa are more advanced evolutionarilyarrow_forwardPeople studying fossils have to employ which of the following species concepts? a. The Morphospecies Concept b. The Biological Species Concept c. The Phylogenetic Species Concept d. The Physical Species Conceptarrow_forward
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