Tetrapod digits are known to be
a. an entirely novel evolutionary structure d. controlled by genes present in the
common ancestor of primates
b. controlled by the Pitx1 gene e. the result of a mutation in a Hox gene
c. controlled by genes that were present in
the common ancestor of sharks
C
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Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
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________ is the inner most germ cell layer that forms during gastrulation.
A. Ectoderm B. Mesoderm C. Endoderm D. Mesentery E. Epidermis
Which of the following statements is true of
the proteobacteria? a. They are the most diverse group of bacteria. b. Some are photoautotrophs. c. Some are chemoautotrophs. d. Some are chemoheterotrophs. e. All of these are true
When a bud breaks of and makes a new organism it is called what?
What will be an ideal response?