Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 24, Problem 11PIAT
Summary Introduction
To review:
The present human population is not considered as different species under the phylogenetic, biological, and morphospecies concepts.
Introduction:
The ability of the human population to interbreed among themselves successfully originates from a common ancestor and the presence of the similar anatomical structure make them nondifferentiable under the biological, phylogenetic, and morphospecies concepts.
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Were any of your physical traits autapomorphic or synapomorphic when plotted on the gene trees? Which ones and for which species? Phylogeneticists often refer to these physical traits as “evolutionarily significant,” what do you suppose they mean by this?
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).
HINT = use Eqn 7.1, several times- first to estimate mutation rate. Then to estimate the unknown time since divergence
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 24 Solutions
Biological Science (7th Edition)
Ch. 24 - 1. What distinguishes a morphospecies?
a. It has...Ch. 24 - 2. Which of the following describes vicariance?
a....Ch. 24 - Prob. 3TYKCh. 24 - 6. Sexual selection favors individuals with traits...Ch. 24 - 7. QUANTITATIVE If one species (2n = 10) crosses...Ch. 24 - Prob. 10TYPSSCh. 24 - Prob. 11PIATCh. 24 - 12. Before the application of DNA sequencing to...Ch. 24 - Svante Pääbo and colleagues sequenced the...
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