CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
3rd Edition
ISBN: 9780135191811
Author: Urry
Publisher: PEARSON
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Chapter 20, Problem 2TYU
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.
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What consequences does horizontal gene transfer pose for evolutionary biologists?
a. It can pose difficulty in the reconstruction of phylogenetic trees, because it can obscure phylogenetic relationships.
b. It can pose physiological problems in some organisms, making it very hard to study them.
c. It can pose difficulty in breeding between different individuals of the same species.
d. Because it is transfer of genes between the same species, it can make individuals look very more similar than they actually are.
e. All of the above.
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.
Which of the following is/are TRUE in phylogenetic analysis?
0000000
A. In a phylogram, the longer the branch length, the lesser genetic change.
B. A bootstrap value of 90-100 indicates a weakly supported clade.
C. Neighbor-Joining and Maximum Parsimony does not consider convergence as an influencing factor in creating an evolutionary tree.
D. Phylogenetic analysis treats each base of a sequence as a molecular character for analysis.
Both C and D are True statements.
Both B and Care True statements.
None. All of the statements are False.
Chapter 20 Solutions
CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
Ch. 20.1 - Based on the tree in Figure 20.4, are leopards...Ch. 20.1 - Which of the trees shown here depicts an...Ch. 20.1 - Prob. 3CCCh. 20.2 - Decide whether each of the following pairs of...Ch. 20.2 - WHAT IF? Suppose that two species, A and B, have...Ch. 20.3 - Prob. 1CCCh. 20.3 - The most parsimonious tree of evolutionary...Ch. 20.3 - Prob. 3CCCh. 20.4 - What is a molecular clock? What assumption...Ch. 20.4 - MAKE CONNECTIONS Review Concept 14.5. Then...
Ch. 20.4 - WHAT IF? Suppose a molecular clock dates the...Ch. 20.5 - Why is the kingdom Monera no longer considered a...Ch. 20.5 - Prob. 2CCCh. 20.5 - Prob. 3CCCh. 20 - In a comparison of birds and mammals, the...Ch. 20 - To apply parsimony to constructing a phylogenetic...Ch. 20 - Prob. 3TYUCh. 20 - Prob. 4TYUCh. 20 - Prob. 5TYUCh. 20 - If you were using cladistics to build a...Ch. 20 - Prob. 7TYUCh. 20 - SCIENTIFIC INQUIRY DRAW IT (a) Draw a phylogenetic...Ch. 20 - FOCUS ON EVOLUTION Darwin suggested looking at a...Ch. 20 - Prob. 10TYUCh. 20 - SYNTHESIZE YOUR KNOWLEDGE This West Indian manatee...
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- When presenting a phylogenetic tree, researchers will often indicate the level of bootstrap support for each clade. This is done by placing a percentile number along the branch leading to that clade, as in the figure above. Here, the number 80 indicates that the - A. the outgroup is a monophyletic clade in 80% of the bootstrap replicates. B. the ingroup is a monophyletic clade in 20% of the bootstrap replicates. C. the outroup is a monophyletic clade in 20% of the bootstrap replicates. D. the ingroup is a monophyletic clade in 80% of bootstrap replicates.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_forwardYou are evaluating five phylogenetic trees generated from a single cladistics analysis. Tree A shows 21 evolutionary events (i.e. the evolution of a shared, derived trait), Tree B shows 7 events, Tree C shows 18 events, Tree D shows 10 events, and Tree E shows 9 events. Which tree is most likely the correct one? Group of answer choices Tree A Tree D Tree B Tree E Tree Carrow_forward
- The figure shows a phylogenetic tree of various members of the order Proboscidea, which includes modern elephants. Which of the following claims is best supported by the information in the figure ? a.The mastodon and the Stegodon diverged from their common ancestor 22 million years ago. b.The common ancestor of the African elephant and the mastodon is the Palaeomastodon. c.The mammoth diverged from its most recent common ancestor with African elephants before the mastodon diverged from its most recent common ancestor with Stegodons. d.The Asian and African elephants are the most closely related species shown on the tree.arrow_forwardD. Place a star at the most recent common ancestor that A-D share. E. Place a triangle at the most recent common ancestor that A-E share.arrow_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_forward
- Look at picture attached A) What does the phylogeny suggest about the evolutionary process that led to the trait differences by habitat? a. convergent evolution b. adaptive radiation c. phenotypic plasticity B) Choose different functional forms from two of the habitats shown in the collage and describe how one or more differences in form may represent an adaptation to their different environment. Example: compare plant form for lobeliads in montane bog to cloud forest understoryarrow_forwardWhich statement portrays the concept of ontogeny in phylogenetics? option a.) scientist gathers physiological traits and genetic data about a group of endemic monkeys. option b.) Both chick and human embryos go through a stage where they have slits and arches in their necks that are identical to the gill slits and arches of fish. option c.) The progression of morphological forms observed in fossil record is consistent with inferences about the major branches of descent in the tree of life. option d.) Crocodiles have amniotic eggs while rodents and rabbits don't have.arrow_forwardDerived characters are traits: A. that are more complicated than ancestral characters B. that characterize the last common ancestor of a particular collection of species. C. that have evolved after the last common ancestor of a particulan collection of species. D. that are less well suited to the environment than ancestral characters.arrow_forward
- Phylogenetic trees are a type of model that can be used to show how organisms are related through common ancestry. The phylogenetic tree model represents nodes numbered 1 through 8. Using evidence from the phylogenetic tree determine which species would be MOST closely related to the species on branch C? Question options: The species on Branch A is most closely related to the species on branch C because they share the most recent common ancestor at node 1. The species on Branch B is most closely related to the species on branch C because they share the greatest number of common +ancestors. The species on Branch A & B are both most closely related to the species on branch C because they share the most most recent common ancestor at node 2. The species on Branches F, G, H, and I are all equally related to the species on branch C because they all split from a common ancestor at the same time which is illustrated by having nodes 2 and 7 at the…arrow_forwardWhen constructing phylogenetic trees, what is the purpose of applying maximum parsimony? Parsimony allows the researcher to "root" the tree. For trees based on morphology, the most parsimonious tree requires the maximum evolutionary events. The outgroup roots the tree, allowing the principle of parsimony to be applied. For trees based on morphology, the most parsimonious is the one that uses the simplest explanation of evolutionary events.arrow_forwarda. draw a diagonal tree b. Which organism is an outgroup? c. Which organisms are sister taxa or share a common ancestor?arrow_forward
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