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. In this study, what is the genus of the study animal?
What will be an ideal response?
Bufo
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When selecting among multiple possible phylogenetic trees that fit our data, we use the principle of ____ , which means we choose the ____ possible hypothesis
In phylogenetic analysis, that means selecting the tree that represents the ____ evolutionary changes or mutations. Fill in the blank with the appropriate word.
Gene inactivation is likely to produce
A. pseudogenes. B. orthologs. C. paralogs. D. homologues. E. horizontal gene transfer (HGT).
Which hormones counteract each other in regulating calcium homeostasis?
A. antidiuretic hormone and aldosterone B. atrial natriuretic peptide and aldosterone C. parathyroid hormone and vitamin D (1,25 dihydroxyvitamin D) D. antidiuretic hormone and parathyroid hormone E. antidiuretic hormone and vitamin D (1,25 dihydroxyvitamin D)
In a flowering plant, the ____ is the site of meiosis and, ultimately, the production of pollen
a. stigma b. style c. carpel d. anther
e. filament