Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 18, Problem 4SQ
Summary Introduction
Concept introduction: Cladistics is a biological classification approach in which the organisms are grouped based on the most recent common ancestor. Like any other method of classifications, it has also its own procedures, hypothesis, and limitations. Cladistics is based on both parsimony analysis and derived traits.
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Rapid rates of character change relative to the rate of speciation pose a problem for cladistics because
a. the frequency with which distantly related species evolve the same derived character state may be high.
b. evolutionary reversals may occur frequently.
c. homoplasy will be common.
d. All of the choices are correct.
a.Explain the four basic criteria on which RH Whittaker system of classification is based on.
b. Briefly describe the main concepts of evolution by natural selection
c.Distinguish between the two kingdom classifications carolus Linnaeus.
Parsimony criterion is used to choose the hypothesis of relationships which requires the least
Select one:
a. homoplasy
b. homology
Chapter 18 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 18 - In cladistics, the only taxon that is always...Ch. 18 - Prob. 2SQCh. 18 - A clade is _________. a. defined by a derived...Ch. 18 - Prob. 4SQCh. 18 - In cladograms, sister groups are _______ . a....Ch. 18 - Through _______, a body part of an ancestor is...Ch. 18 - Homologous structures among major groups of...Ch. 18 - Prob. 8SQCh. 18 - Mitochondrial DNA sequences are often used in...Ch. 18 - Hawaiian Honeycreeper Phylogeny The Poouli...
Ch. 18 - Prob. 2DAACh. 18 - Hawaiian Honeycreeper Phylogeny The Poouli...Ch. 18 - Hawaiian Honeycreeper Phylogeny The Poouli...Ch. 18 - Molecular clocks are based on comparisons of the...Ch. 18 - True or false? DNA barcoding can identify an...Ch. 18 - A mutation that alters the embryonic expression...Ch. 18 - All of the following data types can be used as...Ch. 18 - True or false? Phylogeny helps us study the spread...Ch. 18 - Prob. 15SQCh. 18 - In the late 1800s, a biologist studying animal...Ch. 18 - The photos shown above illustrate a case of...
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- Cladistic methods: a. have distinct criteria for recognizing genera versus species. b. rely equally on all traits that can be measured or observed. c. cannot be used below the level of the species (e.g., to identify races). d. classify organisms based on shared ancestry e. all of the above are correctarrow_forwardWhat do scientists use to apply cladistics? a. homologous traits b. homoplasies c. analogous traits d. monophyletic groupsarrow_forwardWhich assumption of cladistics is stated incorrectly? a. Living things are related by descent from a common ancestor. b. Speciation can produce one, two, or three new species. c. Traits change from one state to another. d. The polarity of a character state change can be determined.arrow_forward
- Traits that are specialized to a particular lineage, and not widely shared among remotely related lineages, are called (a)ancestral (primitive) (b)derived (modified) (c) non adaptivearrow_forwardWhat is not always true of a valid binomial species name like Homo sapiens? A. It includes the genus name B. It is the first published name applied to the biological species C. It is defined by autapomorphic character states D. Technically, it consists of a noun and an adjective asaparrow_forwardA cladogram or phylogenetic tree is used to classify organisms into groups based on their shared characteristics, where each node or branching point is known as _________________. Group of answer choices A. Common ancestry B. New species C. Reproductive isolation D. New characteristic E. None of the answers are correctarrow_forward
- Which assumption of cladistics is stated incorrectly?a. Living things are related by descent from a common ancestor.b. Speciation can produce one, two, or three new species.c. Traits change from one state to another.d. The polarity of a character state change can be determined.arrow_forwardAll of the following data types can be used as evidence of shared ancestry except similarities in _______ . a. amino acid sequence d. embryonic development b. DNA sequence e. form due to convergence c. fossil morphology f. all are appropriatearrow_forwardConstructing a cladogram______ . a. may involve parsimony analysis b. helps us rank species into taxa c. reveals convergent structures d. is a necessary part of DNA barcodingarrow_forward
- Organisms that are closer together on a cladograma. are in the same family.b. comprise an outgroup.c. share a more recent common ancestor than those organisms that are farther apart.d. share fewer derived characters than organisms that are farther apart.arrow_forwardThe principle of parsimony a. helps evolutionary biologists distinguish among competing phylogenetic hypotheses. b. does not require that the polarity of traits be determined. c. is a way to avoid having to use outgroups in a phylogenetic analysis. d. cannot be applied to molecular traits.arrow_forwardIn cladistic analysis, (a) ancestral characters are used to reconstructphylogenies (b) characters must be homoplastic (c) polyphyletic groups are preferred (d) outgroup analysis is rarely used (e) shared derived characters are the preferred evidence for relatednessarrow_forward
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