Populations of amphibians, including frogs and toads, have been plagued by disease and high rates of deformity. A recent study investigated whether problems among the populations have arisen due to poisons from chemicals associated with agriculture. Biologists from the University of Florida collected local adult cane toads (Bufo marinus) from more than 20 different locations. Toads were collected from areas close to agriculture; both large-scale and small-scale farms as well as from suburbs. At collection sites where 50-97% of the adjacent land was farmed, males showed high levels of feminization. Feminized male toads were similar in color to females and had lower levels of testosterone and often also deformed gonads. These changes can lead to sterile males or changes in behavior that
prevent mating from occurring. Which of the following statements would be considered a hypothesis for this study?
What will be an ideal response?
Agricultural chemicals cause deformities and feminization amongst cane toads.
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How would the phenotypes of progeny differ if a trait was produced from the influence of many genes, compared to a trait caused by a single gene with two alleles and incomplete dominance?
A. They would not differ, and progeny in both would have an array of phenotypes that vary continuously across a range. B. The progeny from the single-gene cross would all be identical, whereas the manygene cross would vary continuously across a spectrum. C. The progeny from the single-gene cross would have three phenotypes, whereas the progeny of the trait caused by many genes would vary continuously across a spectrum.
Which of the following is true of bacterial translation termination?
A. The ribosome continues to synthesize protein until it reaches the 3' end of the mRNA. B. Termination requires the degradation of the ribosome. C. Termination is signaled by the presence of a stop codon in the mRNA.
What cycle includes movement of a nutrient from rocks and sediments, waters, and/or atmosphere into and out of food webs?
a. sedimentary b. nitrogen c. water d. biogeochemical e. carbon
A mutation seen in Drosophila is found to cause antennae to grow on the abdomen of the flies. What type of mutation is this likely to represent?
A) evolutionary mutation B) silent mutation C) homeotic mutation D) lethal mutation