WHAT IS LIFE? A GUIDE TO BIO 3E+LAUNCHPA
3rd Edition
ISBN: 9781319103316
Author: PHELAN
Publisher: Macmillan Higher Education
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Chapter 10, Problem 9MC
Summary Introduction
Introduction:
Similarities and differences between organisms can be used to guess how closely they are related.
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What 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.
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.
Define homology and homoplasy and explain their connection to the concept of parsimony in phylogenetic analysis. Provide an example of each and discuss the challenges they may present when inferring evolutionary relationships.
Chapter 10 Solutions
WHAT IS LIFE? A GUIDE TO BIO 3E+LAUNCHPA
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- Phylogenetic 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_forward6) One could apply the phylogenetic species concept by a.comparing the morphology of two organisms. b.tracing the common ancestry of two organisms. c.determining the overall similarity in the ecological niche of two organisms. d.mating two organisms to see if viable offspring result.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_forward
- which statement is false? 1)In the context of the evolution of senescence, the aphorism "live fast and die young" means that organisms with a more risky behavior will have a shorter life span. 2)Allopatric speciation is a type of speciation process that takes place in different geographic locations.arrow_forwardA 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_forwardShown above are three possible phylogenetic trees for species I, II and III reconstructed based on the 4-nucleotide DNA sequences given in the righthand table. In every tree, each hatchmark on a branch represents a single base-change event. The most parsimonious tree would be - A. Both X and Y. B. X. C. Y. D. Both Y and Z. E. Z.arrow_forward
- Which of the following is FALSE regarding phylogenetic trees? 1) The branch lengths on the tree are scaled to molecular (DNA) changes and/or time. 2)Phylogenetic trees have shown us that there is much more bacterial diversity compared to eukaryotes. 3) Phylogenetic trees show the evolutionary relatedness of different organisms. 4). The branch lengths on the tree depict abiotic and biotic factors affecting speciation.arrow_forwardPhylogeny refers to the evolutionary descent of taxa. It refers to the relationship between ancestors and descendants and relationships among descendant taxa. It shows the lineage of taxa which can be summarized in a branching diagram called a phylogenetic tree.a. express some basic evolutionary relationships among groups of microorganisms, plants, and animals; b. illustrate the relationship of organisms with their environment; and c. analyze environmental factors contributing to biodiversity richness and lossarrow_forwardPhylogenetic trees are based on a. natural selection. b. genetic drift. c. homology. d. none of the above.arrow_forward
- Below are phylogenetic trees depicting the relationships among four species, A, B, C, and D. Which of the following statements is correct? Tree (1) and Tree (2) are the same tree. Tree (2) and Tree (4) are the same tree. Tree (2) and Tree (3) are the same tree. All four trees are in fact the same tree. All four trees are in fact different trees.arrow_forwardStudy the diagrams below. The diagrams represent four possible phylogenetic trees showing the relationship between the four species: M, L, S, and R. B A M LS R M LR +d \t R SML RM S tota -444 What is the plausible explanation for the appearance of autapomorphic character c in species L and S of tree A although they do not share a most recent common ancestor?arrow_forwardSpecies Concepts Review The Baltimore Orioles and Black-backed Orioles species complex has conflicting evidence in support of each being their own species and in support of them being the same species. Review the evidence below for each hypothesis, then, using that evidence, explain whether they should be classified as distinct or the same species based on each species concept. Then, using the overall evidence, decide whether to classify them as the same or different species. Genetic Information (In the Species Concepts lab, we used a "controversial" 10% cutoff. A more realistic cutoff might be 1%. Let's use a 1% cutoff for this activity.) Sequence Differences Baltimore Oriole vs Black- backed Oriole Cytochrome b 0.26% Control region 0.74% 2A. Based on the genetic information above, should the Baltimore Oriole and Black-backed Oriole be classified as one species or two species?arrow_forward
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