Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter D, Problem 10P
Denisovans are known from bones found in Denisova Cave in the Altai Mountains in Siberia, but traces of their DNA are found in Australians and Melanesians, whose ancestors likely migrated across Asia much farther to the south. How can these geographic differences be reconciled?
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Why are human and chimpanzee DNA 96 percent similar? Please choose the best option.a) Both groups show similarities in their fossil record.b) Humans and chimpanzees share several similar traits such as the use of tools.c) These two species descended from a recent common ancestor.d) Natural selection has favored those particular genes in both humans and chimpanzees.
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 D Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Ch. D - Why might mitochondrial, Y chromosome, and...Ch. D - What insights have analyses of human mitochondrial...Ch. D - What lines of evidence support the hypothesis that...Ch. D - Discuss how both gains and losses of regulatory...Ch. D - D.5 How do copy number variants arise? Do they...Ch. D - Consider possible societal and ethical dilemmas...Ch. D - Prob. 7PCh. D - Describe how selection at a locus can result in a...Ch. D - D.9 How can ancient DNA provide insight into past...Ch. D - D.10 Denisovans are known from bones found in...
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- The Out of Africa hypothesis (also called the African Replacement hypothesis) proposes that Homo sapiens arose in Africa and evolved there for several hundred thousand years. Then, some 85,000 years ago, a small band of Homo sapiens migrated out of Africa and populated the remainder of the world. Based on this hypothesis, what predictions would you make about worldwide human variation in mtDNA?arrow_forwardOnce nuclear DNA sequencing became fast and able to handle sequencing ancient DNA, living humans were found to have some Neanderthal genes. Is this finding clear evidence that some early modern humans did indeed hybridize with Neanderthals? Why?arrow_forwardA fossil believed to be the most recent common ancestor between housecats and lions is radio-dated to about 11 million years ago (mya). An analysis of a neutral section of mitochondrial DNA in both species finds 15 DNA base pair differences between the two cats today. Meanwhile, an analysis of housecats and pumas shows 4 DNA base pair differences between them, which are believed to have diverged around 3 mya. Using this data, what is the best estimate of the time since divergence of housecats and lynx, which have 11 DNA base pair differences in this mitochondrial DNA region? 5 mya O6 mya O 7 mya O8 mya 9 myaarrow_forward
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