A strain of an organism with an increased mutation rate is known as a(n)
A) adaptive mutagen strain.
B) hypermutable or mutator strain.
C) encoded dnaQ system.
D) phenotypic variation.
Answer: B
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If speciation occurred because of changes in chromosome counts between the original parents and the offspring, would this be an example of speciation by natural selection?
A. Yes, because all speciation events involve natural selection. B. Yes, because there is genetic variation present due to differences in chromosome numbers. C. Yes, because natural selection is involved whenever there is a difference in the genome size between the parents (species 1) and the offspring (species 2). D. No, speciation occurred, but natural selection was not involved. E. No, natural selection can only act on populations, not on individuals.
Which of the following is a disadvantage of a correlational experiment?
A) Subjects may not know exposure levels. B) It is expensive and time consuming. C) It is not feasible for rare diseases or environmental factors of interest. D) It is only feasible for hypotheses for which an experimental treatment can be applied.
Plasmodium, the organism that causes malaria, is a(n)
A) amoeba. B) stramenopile. C) ciliate. D) alveolate.
As a result of deforestation, the number of different habitats in a particular locale declines while, at the same time, the rate of cladogenesis in a particular lineage of animals in this locale increases. Choose the feature that most likely accounts for this observation.
A) adaptive radiation B) allopolyploidy C) autopolyploidy D) increased habitat differentiation E) increased sexual selection