The fossil record indicates that whales evolved from
A. sharks.
B. dinosaurs.
C. hoofed mammals.
D. fish.
Answer: C
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Use the principle of parsimony and molecular genetic data to choose a phylogenetic tree for your hypothesis of how the extant species were derived from the ancestor.
A. Tree 1 requires the most mutations, making it the best choice.
B. Tree 1 requires the fewest mutations, making it the best choice.
C. Tree 2 requires the most mutations, making it the best choice.
D. Tree 2 requires the fewest mutations, making it the best choice.
E. Both trees are equally good because sequences A, B, C, and D are the same in both.
The outcome of the process illustrated in Figure 26-2 is:
a. four new genetically identical cells that differ genetically from what they were before. b. four new but genetically distinct cells. c. two new genetically identical cells that differ genetically from what they were before. d. two new but genetically distinct cells. e. one male and one female cell.
A defect in the HoxA-3 would most likely result in
A. defects of the thyroid. B. defects of the limbs. C. an enlarged heart. D. defects of the lungs. E. abnormal positioning of the kidneys.
Which of the following organisms are adapted to living in a desert?
A) spadefoot toads B) oak trees C) lemmings D) spruce trees