Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 20, Problem 17CTQ
Some organisms that appear very closely related on a phylogenetic tree may not actually be closely related. Why is this?
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Which 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 evolutionarily
What does a phylogenetic tree depict?
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…
Chapter 20 Solutions
Biology 2e
Ch. 20 - Figure 20.6 At what levels are cats and dogs...Ch. 20 - Figure 20.10 Which animals in this figure belong...Ch. 20 - Figure 20.11 What is the largest clade in this...Ch. 20 - What is used to determine phylogeny? mutations DNA...Ch. 20 - What do scientists in the field of systematics...Ch. 20 - Which statement about the taxonomic classification...Ch. 20 - On a phylogenetic tree, which term refers to...Ch. 20 - Which statement about analogies is correct? They...Ch. 20 - What do scientists use to apply cladistics?...Ch. 20 - What is true about organisms that are a part of...
Ch. 20 - Why do scientists apply the concept of maximum...Ch. 20 - The transfer of genes by a mechanism not involving...Ch. 20 - Particles that transfer genetic material from one...Ch. 20 - What does the trunk of the classic phylogenetic...Ch. 20 - Which phylogenetic model proposes that all three...Ch. 20 - How does a phylogenetic tree relate to the passing...Ch. 20 - Some organisms that appear very closely related on...Ch. 20 - List the different levels of the taxonomic...Ch. 20 - Dolphins and fish have similar body shapes. Is...Ch. 20 - Why is it so important for scientists to...Ch. 20 - Describe maximum parsimony.Ch. 20 - Compare three different ways that eukaryotic cells...Ch. 20 - Describe how aphids acquired the ability to change...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- When 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_forwardHow does a phylogenetic tree indicate major evolutionary events within a lineage?arrow_forwardIn the last lab while creating a phylogenetic tree using PAUP/CIPRES, Fagus grandifolia was specified as the outgroup . Why is this step important? If the outgroup is not specified, PAUP or CIPRES will produce an unrooted tree in which outgroup is not connected to the rest of the tree by a common ancestor If the outgroup is not specified, PAUP or CIPRES will produce an unrooted tree in which the outgroup might not branch off prior to the common ancestor of the organisms under study O If the outgroup is not specified, PAUP or CIIPRES will produce an unrooted tree. Unrooted trees do not follow the Law of Parsimony All options are incorrectarrow_forward
- Phylogenetic trees are used to show the evolutionary relationships among various biological species and are usually based upon shared derived characters. In constructing phylogenetic trees, it is useful to first draw up a character table to show the presence or absence of characters among the various groups of organisms being studied. a. Draw up a character table based upon the following shared derived characters of land plants: flowers, seeds, vascular tissues, and dependent embryos. Your character table must include the names/descriptions of the plant groups that are being characterized. b. Construct a phylogenetic tree based on this data.arrow_forwardDo you find it easy to interpret phylogenetic trees? What aspects are the most challenging or what aspects of the tree can be easily misinterpreted? What strategies can students use to correct or avoid these common misinterpretations? Do you consider phylogenetic trees to be reliable indicators of evolutionary relationships? Include a reference.arrow_forwardWithin the field of phylogenetics, what does a “bootstrap value” represent? (write/make 3 points for this question)arrow_forward
- How does a phylogenetic tree relate to the passing of time? Some organisms that appear very closely related to a phylogenetic tree may not actually be closely related (Example. Sharks and dolphins). Why is this?arrow_forwardWhy is it important for scientists to distinguish between homologous and analogous characteristics before building a Phylogenetic tree?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
- 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.arrow_forwardDescribe at least one reason that the traditional phylogenetic tree model may require modification.arrow_forwardWhy is it so important for scientists to distinguish between homologous and analogous characteristics before building phylogenetic trees?arrow_forward
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