Ultraviolet light causes pyrimidine dimers to form in DNA. Some individuals are genetically incapable of repairing some dimers at "normal" rates. Such individuals are likely to suffer from ________
A) xeroderma pigmentosum
B) muscular dystrophy
C) SCID
D) phenylketonuria
E) Huntington disease
Answer: A
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Which of the following statements explains why animals are less likely than plants to speciate by polyploidy?
A) Animals self-fertilize less often than plants, so diploid gametes are less likely to fuse. B) Animals have better mechanisms for repairing chromosomes than plants have. C) Animals are more mobile, so they have more effective prezygotic isolating mechanisms. D) Animals are more mobile, so populations get separated far less often. E) Animals use a more rigorous form of meiosis than plants, making diploid gametes much more difficult to form.
Smaller bodies have a larger surface area relative to their ________ than do larger objects of the same size
Fill in the blank(s) with correct word
Geological evidence indicates that two landmasses, separated by a deep ocean channel, have been moving apart since 45 million years ago. You are studying a group of organisms that has widespread populations on both of the landmasses. Which is the most
likely hypothesis for the group's evolutionary history? A) The group's ancestors were definitely present on the original landmass. B) The group's ancestors cannot have been present on the original landmass. C) If the group's ancestors could not move across the open ocean, it is very likely that they were present on the original landmass. D) The group's ancestors must have independently colonized each of the landmasses from a third location within the past 45 million years.
Foreign genes can be inserted into a single plant cell that is then cultured to produce
A) a genetically modified plant. B) genetically modified seeds. C) a new plant species. D) clones of the organisms from which the genes were taken.