Mutations like bithorax, in which a second pair of wings develops in the place of halteres, give clues to the evolutionary origin of differentiated structures. What inferences might you draw from bithorax, or antennapedia?
What will be an ideal response?
These otherwise different structures have a similar genetic basis, suggesting that they are likely to have a common origin (gene duplication and divergence, for example).
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Which of the following plants is NOT a
gymnosperm? a. cycad b. conifer c. palm d. ginkgo e. gnetophyte
Which of the following statements is false about
pioneer species? a. They have wide ranges of tolerance. b. Many partner with nitrogen-fixing bacteria. c. They remain permanent residents of the community. d. They include lichens and plants with short life cycles. e. They are often small annuals with wind dispersed seeds.
Which of the following may trigger a migraine headache?
a. hormonal changes b. fluorescent lights c. certain foods d. weather changes e. all of these
The molecule that can carry foreign DNA into host cells is a(n) ____.
A. cloning vector B. transcriptase C. DNA ligase D. endonuclease E. DNA polymerase