Campbell Biology, Books a la Carte Plus Mastering Biology with eText -- Access Card Package (10th Edition)
10th Edition
ISBN: 9780133922851
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Chapter 26.5, Problem 3CC
WHAT IF? Ø Suppose a molecular dock dates the divergence of two taxa at 80 million years ago, but new fossil evidence shows that the taxa diverged at least 120 million years ago. Explain how this could happen.
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Imagine that you have the DNA sequences from the intron of a gene in three species called A, B, and C. Species A and B are most closely related, while C is more distantly related. The sequences of A and B differ by 18 base pairs, A and C differ by 26 base pairs, and B and C differ by 28 base pairs. Fossils show that species A and B diverged about 1.2 Mya, but there is no fossil evidence as to when the most recent common ancestor of all three species lived. (Draw a simple tree to help you think about the problem)
Use the genetic data to estimate that date (most recent common ancestor).
What assumptions are you making to get this estimate?
Chapter 26 Solutions
Campbell Biology, Books a la Carte Plus Mastering Biology with eText -- Access Card Package (10th Edition)
Ch. 26.1 - VISUAL SKILLS: Which levels of the classification...Ch. 26.1 - Prob. 2CCCh. 26.1 - Prob. 3CCCh. 26.2 - Decide whether each of the following pairs of...Ch. 26.2 - Prob. 2CCCh. 26.3 - Prob. 1CCCh. 26.3 - Prob. 2CCCh. 26.3 - WHAT IF? Draw a phylogenetic tree that includes...Ch. 26.4 - Explain how comparing proteins of two species can...Ch. 26.4 - WHAT IF? Suppose gene A is orthologous in species...
Ch. 26.4 - Prob. 3CCCh. 26.5 - What is a molecular clock? What assumption...Ch. 26.5 - Prob. 2CCCh. 26.5 - WHAT IF? Suppose a molecular dock dates the...Ch. 26.6 - Why is the kingdom Monera no longer considered a...Ch. 26.6 - Prob. 2CCCh. 26.6 - Prob. 3CCCh. 26 - Humans and chimpanzees are sister species. Explain...Ch. 26 - Why is it necessary to distinguish homology from...Ch. 26 - Prob. 26.3CRCh. 26 - When reconstructing phylogenies, is it more useful...Ch. 26 - Prob. 26.5CRCh. 26 - Prob. 26.6CRCh. 26 - In a comparison of birds and mammals, the...Ch. 26 - To appiy parsimony to constructing a phylogenetic...Ch. 26 - VISUAL SKILLS In Figure 26.4, which similarly...Ch. 26 - Three living species X, Y, and Z share a common...Ch. 26 - Prob. 5TYUCh. 26 - If you were using cladistics to build a...Ch. 26 - VISUAL SKILLS The relative lengths of the frog and...Ch. 26 - EVOLUTION CONNECTION Darwin suggested looking at a...Ch. 26 - SCIENTIFIC INQUIRY DRAW IT (a) Draw a...Ch. 26 - WRITE ABOUT A THEME: INFORMATION In a Short essay...Ch. 26 - SYNTHESIZE YOUR KNOWLEDGE This West Indian manatee...
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- The phylogenetic tree for 12 cat species (Felidae) reproduced at right was assembled from molecular sequence data. Which species is the domestic cats closest relative? Which clade is the sister taxon to tigers? Are bobcats more closely related to cougars or to ocelots? Source: From Warren E. Johnson et al. 2006. The late Miocene radiation of modern Felidae: A genetic assessment. Science 311:7377.arrow_forwardImagine that you have the DNA sequences from the intron of a gene in three species called A, B, and C. Species A and B are most closely related, while C is more distantly related. The sequences of A and B differ by 18 base pairs, A and C differ by 26 base pairs, and B and C differ by 28 base pairs. Fossils show that species A and B diverged about 1.2 Mya, but there is no fossil evidence as to when the most recent common ancestor of all three species lived. (Draw a simple tree to help you think about the problem) Use the genetic data to estimate that date (most recent common ancestor). HINT = use Eqn 7.1, several times- first to estimate mutation rate. Then to estimate the unknown time since divergencearrow_forwardIf phylogenetics is not a factor here, we have _____independent data points, but if phlogeny is the key factor, then we only have independent data points. (a) A 2; 3 06; 2 2; 6 6; 3 3; 2 B Group size EF D (b) Group sizearrow_forward
- WHAT IF? Suppose gene A is orthologous in species 1and species 2, and gene B is paralogous to gene A inspecies 1. Suggest a sequence of two evolutionary eventsthat could result in the following: Gene A differs considerably between species, yet gene A and gene B show littledivergence from each other.arrow_forwardDraw a phylogenetic reconstruction for the hypothetical frog species. Once you have a cladogram you feel confident about, use lines and labels on cladogram to indicate where character states hanged. How many evolutionary changes occurred in your phylogeny? Is there evidence of an evolutionary convergence having occurred in your phylogeny? How about evolutionary reversals?arrow_forward4 05 4 3. 2. D.arrow_forward
- 5. 5. Draw a phylogeny the following taxa: shark; tuna; frog; lizard; mouse; whale. On your phylogeny label the first occurrence/evolution of the following traits: cartilaginous skeleton; bony skeleton; hair; four limbs; shelled eggs. Describe a synapomorphy using any of the traits you labeled on the tree.arrow_forwardTest Your Understanding Apply and Analyze 9. In interpreting a cladogram, (a) we can identify the specific ancestor of each taxon by tracing each branch back to the node closest to the root (b) taxa on the right side of a cladogram have evolved from the taxa on the left side (c) the relative placement of smaller branches allows us to determine the number of years since a particular taxon has evolved (d) we can determine relationships by tracing along the branches back to the most recent common ancestor (e) we must first identify horizontal gene transferarrow_forwardThe phylogentic tree below depicts the evolutionary relationships of the following species A through M.arrow_forward
- What does point 2 indicate in the following cladogram? 3FD The point at which species C and D diverged The common ancestor of species A, B, C, and D The point at which species B, C, and D diveraed from species Aarrow_forwardPlease solvearrow_forwardTree 1 Tree 2 Tree 3 outgroup В C outgroup В outgroup A В We have gathered some morphological data on three species of mythical mammals and the outgroup; these data are presented in the table below. Species Number of toes Eye color Tail Number of molars Outgroup 4 Brown Present 12 A Blue Absent 10 B Blue Present 12 C 5 Blue Absent 10 Now our task is to discover which of the three trees above is the most parsimonious, representing the most likely pathway of evolution. We determine the best tree by fitting the data in the table to each tree and calculating the number of evolutionary changes that are required. To facilitate our calculations, we will use the table below. The numbers in the table indicate the number of evolutionary changes that are required for each character in each tree.arrow_forward
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What is Evolution?; Author: Stated Clearly;https://www.youtube.com/watch?v=GhHOjC4oxh8;License: Standard Youtube License