Researchers believe the evolution of common bread wheat (Triticum aestivum) resulted from a series of ____ between
related species, some of which produced ____ species.
a. hybridizations; allopolyploid
b. geographic separations; allopolyploid
c. centromere inversions; autopolyploid
d. chromosome deletions; autopolyploid
e. chromosome rearrangements; autopolyploid
ANSWER: a
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Consider an antibacterial drug. In which of the following cases would the action of the drug be considered primarily bacteriostatic?
A. The MLC is 10-20 times higher than the MIC. B. The MLC is 2-4 times higher than the MIC. C. The MLC is lower than the MIC. D. The minimal lethal concentration (MLC) is equal to the minimal inhibitory concentration (MIC).
In human blood groups, the fact that an individual can have an AB blood type is an example of ___________
A. incomplete dominance B. incomplete penetrance C. sex-influenced trait D. temperature-sensitive conditional allele E. codominance
Of the following sequences, which one reflects the best scientific knowledge about the succession of Homo species from the past until the present?
A. Homo heidelbergensis ® Homo habilis ® Homo sapiens ® Homo erectus B. Homo habilis ® Homo heidelbergensis ® Homo erectus ® Homo sapiens C. Homo heidelbergensis ® Homo sapiens ® Homo erectus ® Homo habilis D. Homo sapiens ® Homo heidelbergensis ® Homo habilis ® Homo erectus E. Homo habilis ® Homo erectus ® Homo heidelbergensis ® Homo sapiens
Answer the following statements true (T) or false (F)
Genetic heterogeneity refers to mutations in different genes that cause the same symptoms.