CUSTOM BIOLOGY
CUSTOM BIOLOGY
19th Edition
ISBN: 9781323945490
Author: Urry
Publisher: Pearson Custom Publishing
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Chapter 22, Problem 5TYU

DNA sequences in manv human genes are very similar lo the sequences of corresponding genes in chimpanzees. The most likely explanation for this result is that

  • (A) humans and chimpanzees share a relatively recent com­mon ancestor.
  • (B) humans evolved from chimpanzees.
  • (C) chimpanzees evolved from humans.
  • (D) convergent evolution led to the DNA similarlties.
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Students have asked these similar questions
Cat DNA is much more similar to dog DNA than to tortoise DNA. Why? (a) Cats and dogs are both carnivores and take in similar nutrients. (b) Cats and dogs have lived together with humans for a long period of time, so they have grown more similar. (c) Cats and dogs have more offspring during their lifetime than tortoises have, so their DNA changes less rapidly. (d) Cats and dogs have a common ancestor that is more recent than the common ancestor of cats and tortoises.
Homology can be defined as the presence of common structures because of shared ancestry. Homology can involve genes, proteins, or anatomical structures. As a result of “descent with modification,” many homologous structures have adapted different purposes. (a) List three anatomical structures in vertebrates that are homologous but have different functions. (b) Is it likely that homologous proteins from different species have the same or similar functions? Explain. (c) Under what circumstances might one expect proteins of similar function to not share homology? Would you expect such proteins to be homologous at the level of DNA sequences?
Once 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?

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