When fluorescently labeled oligonucleotides that are known to be specific to the microbe of interest are used to label natural samples, the technique is known as ________.
A. fluorescent in situ hybridization
B. gel electrophoresis
C. epifluorescence microscopy
D. polymerase chain reaction
Answer: A
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Inbred lines of animals, such as laboratory mice, are useful for studying complex traits because:
A. individuals are genetically identical, so differences in traits must be due to environmental differences. B. although individuals differ both genetically and environmentally, the genetic differences are known, so differences in traits can be understood. C. animals are kept in identical environments, so any differences in traits are due to differences in their genes. D. both genetic and environmental differences between individuals are known, making differences in their traits easy to understand. E. None of these choices is correct.
Research on speciation of Hawaiian crickets, shown in the accompanying figure, has led researchers to conclude that ________
A) these cricket species have diverged by a mechanism known as assortative mating B) females of different species have strong preferences for the singing pulse rate of the males of their own species C) female preference for male singing pulse rate is genetically linked to the combination of genes regulating the singing pulse rate of males D) All of the above are accurate.
What process refers to dramatic phenotypic changes that sometimes occur in evolution, such as the
appearance of feathered wings during the evolution of birds? a. paedomorphosis b. gradualism c. macroevolution d. allopolyploidy e. microevolution
You might have been accidentally exposed to an insecticide while working in a citrus grove. What symptoms of poisoning would you watch for?
A) depression B) muscle tremors C) Alzheimer's disease D) excessive urination