Chemical mutagens often act by altering the
A. alkyl groups of the nucleobase.
B. nucleobase sequence.
C. number of binding sites on the nucleobase.
D. hydrogen bonding properties of the nucleobase.
D
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The percentage of different colored water boatmen eaten by fish were graphed relative to the frequency of that color in the population. Based on the graph, a population of water boatmen would _____
A. increase in rare genotypes.
B. have no variation in genotype frequencies.
C. lose rare genotypes.
D. increase in size.
E. decrease in genetic variability.
In 2000, 87% of the wild rat populations in Stadtlohn, Germany was resistant to the poison bromadiolone. This
indicates that ____was/were commonly used as a rat poison(s) here, and the rat's resistance is an example of ____ selection.
a. warfarin; directional b. bromadiolone; directional c. both warfarin and bromadiolone; disruptive d. neither warfarin nor bromadiolone; stabilizing e. bromadiolone; disruptive
The use of recombinant DNA technology to treat genetic diseases ("gene therapy") has been held back by difficulty
A) delivering cloned genes into target cells and getting the genes to function properly. B) in obtaining the appropriate sequence information from individual people. C) cloning human genes. D) in identifying human genes that cause disease. E) cloning and identifying human genes that cause disease.
Which cross will produce only heterozygous offspring?
A) AA aa B) AA Aa C) Aa Aa D) Aa aa