Oceanic noise pollution from commercial shipping
a. results from large tankers generating lowfrequency
sounds.
b. may frighten whales.
c. may drown out whales’ acoustical signals.
d. is a dilemma with no solution that is both easy
and inexpensive.
e. includes all of these.
Answer: e
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What would be the phenotypic and genotypic ratios of a cross between two individuals that are heterozygous for an incompletely dominant trait?
1.3:1 and 1:2:1 2.1:2:1 and 1:2:1 3.1:2:1 and 3:1 4.9:3:3:1 and 3:1
After surviving a bottleneck, a population recovers to the point where it consists of as many individuals as it did prior to the bottleneck. Which of the following statements is most likely to apply to this population?
A) The postbottleneck population exhibits less genetic variation than the prebottleneck population. B) The bottleneck subjected the population to stabilizing selection. C) The postbottleneck population has less of a chance of going extinct than did the prebottleneck population. D) The postbottleneck population exhibits more genetic variation than the prebottleneck population.
All of the following functions are performed by plant vacuoles EXCEPT:a
maintaining hydrostatic (turgor) pressure. b. waste storage and recycling. c. storage of proteins. d. breakdown of unneeded cellular materials. e. storage of nucleic acids.
What conclusions did Beadle and Tatum reach with their studies of Neurospora?
a. Each mutant gene affected three enzymes. b. Each mutant gene affected a pair of enzymes. c. Each mutant gene affected only one enzyme. d. Mutant genes had no effect on the enzymes produced by the cells. e. Each mutant gene affected as many enzymes as were present in a particular metabolic pathway