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Chapter 23, Problem 4TYU

A genetic change that caused a certain Hox gene to be expressed along the tip of a vertebrate limb bud instead of farther back helped make possible the evolution of the tetrapod limb. This type of change is illustrative of

  1. A.    the influence of environment on development.
  2. B.     paedomorphosis.
  3. C.     a change in a developmental gene or in its regulation that altered the spatial organization of body parts
  4. D.    heterochrony.
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The Brachyury and Tbx5 in vertebrates and the Ap3 gene in flowering plants a. are examples of Hox genes. b. are examples of co-opting a gene for a new function. c. are homologues for determining the body plan of eukaryotes. d. help regulate the formation of appendages.
Which of the following statements is FALSE? a. Only vertebrates possess HOX genes. b. HOX genes are transcription factors. c. Hox genes are very highly conserved in the genome location and function among organims. d. HOX genes are activated in a very predictable pattern.
The bones in the front fins of whales and the bones in the human arm evolved from a common ancestor but carry out different functions. This is an example of A. homologous structures. B. vestigial structures. C. analogous structures. D. embryonic structures.
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