Biology
11th Edition
ISBN: 9781259188138
Author: Peter H Raven, George B Johnson Professor, Kenneth A. Mason Dr. Ph.D., Jonathan Losos Dr., Susan Singer
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 23, Problem 2A
Rapid rates of character change relative to the rate of
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.
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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.
Derived 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.
What kind of trait is important to cladistics? a. shared derived traits b. shared ancestral traits c. analogous traits d. parsimonious traits
Chapter 23 Solutions
Biology
Ch. 23 - Overall similarity of phenotypes may not always...Ch. 23 - a. is based on overall similarity of phenotypes....Ch. 23 - The principle of parsimony a. helps evolutionary...Ch. 23 - Parsimony suggests that parental care in birds,...Ch. 23 - The forelimb of a bird and the forelimb of a...Ch. 23 - In order to determine polarity for different...Ch. 23 - In a paraphyletic group a. all species are more...Ch. 23 - A paraphyletic group includes a. an ancestor and...Ch. 23 - Prob. 9UCh. 23 - A taxonomic group that contains species that have...
Ch. 23 - Rapid rates of character change relative to the...Ch. 23 - Species recognized by the phylogenetic species...Ch. 23 - Prob. 1SCh. 23 - Identifying outgroups is a central component of...Ch. 23 - As noted in your reading, cladistics is a widely...Ch. 23 - Across many species of limpets, loss of larval...Ch. 23 - Birds, pterosaurs (a type of flying reptile that...Ch. 23 - AID:1825 | 10/04/2018 6. In what sense does the...
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- a) What is the best estimate (mean age), in millions of years, for the divergence of the clade containing the American Giant Short Faced Bear from the clade containing the Sloth Bear? b) According to Figure 1, bears as a group experienced substantial evolutionary radiation near what geological boundary? c) True or False. An entire clade of bears has gone extinct because the two extinct bear species in the figure are sister species. d) What bears are the nearest relatives of the Sun Bear?arrow_forwardWhich of the following are true about outgroups? a. They help identify plesiomorphic traits in the phylogeny b. They are a taxa that is known to not be within the species group in question c. They do not have any autapomorphic traits d. They are less evolved than the species of interestarrow_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
- A. Which two alien species are likely to be the most related? Why? B. Which two alien species are likely the least related? Why? C. In this cladogram, how many times have lineages diverged? D. On your cladogram, circle the most recent common ancestor of the pingests and persnippys.arrow_forwardWhat pattern of speciation is illustrated by the development of the allopolyploid species? A. allopatric speciation B. sympatric speciation C. cladopatric speciation D. anapatric speciationarrow_forwardWhich of the following are true about outgroups? (multiple answers allowed) A) they help identify plesiomorphic traits in the pylogeny B) they are a taxa that is known to not be within the species group in questionC) They do not have any autapomorphic traits D)they are less evolved than the species of interestarrow_forward
- 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_forwardWhen evaluating multiple cladograms, what is the name of the principle used to decide which cladogram most likely shows the correct evolutionary relationships? Group of answer choices a. principle of parsimony b. principle of persimmons c. principle of parsley d. principle of paisley e. principle of Penelope f. principle of pineapplearrow_forwardCladistic principles suggest that: a. All apes are hominins. b. Outgroups can help to define natural groups by showing what is primitive, and hence, what is derived. c. Birds are crocodiles. d. Species boundaries are fuzzy. e. None of the above is correct.arrow_forward
- Which of the following statements about convergent evolution is true? (a) It demonstrates how similar environments can lead to different physical structures. (b) It demonstrates how similar environments can lead to the same physical structures. (c) It demonstrates that similarity of structures is due to descent from a common ancestor. (d) It demonstrates that similarity of structures is due to random chance.arrow_forwardWhat is a Homology? A) When an anatomic feature is shared among organisms and their descendants B) When two organisms appear the same C) When convergent evolution produces similar phenotypesarrow_forwardCladistic 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_forward
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