Which of the following involves one gene suppressing the expression of another gene?
a. Epistasis
b. Recombination
c. Linkage
d. Incomplete dominance
a. Epistasis
Epistasis involves one gene suppressing the expression of another gene.
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Horizontal gene transfer is not thought to play a major role in the exchange of which of the following genes between bacterial species?
A. genes encoding rRNAs B. genes conveying antibiotic resistance C. genes involved in nitrogen fixation D. genes involved in bacterial photosynthesis
The accompanying figure shows that the rate of alarm calls made by black-tailed prairie dogs is dependent on a perceived threat by a predator. This behavior most closely approximates that predicted by ________
A) mutual benefit B) selfishness C) altruism D) spite
During which stage of meiosis do the sister chromatids separate?
a. metaphase I b. anaphase I c. metaphase II d. anaphase II e. telophase II
Scientists have warned doctors of the danger of their increasing use of antibiotics (for instance, penicillin) for treating minor illnesses. They are concerned because ____________.
A) humans will become tolerant to the effects of drugs B) excessive use of these drugs leads to a diminished sensitivity to them C) strains of microorganisms that are resistant to these drugs will be selected D) the drugs will be metabolized more quickly by our bodies, decreasing their effectiveness E) none of these