Why is widespread resistance to tuberculosis (TB) not likely to evolve any time soon?
A) Only a small percentage of people who are nonresistant to the bacterium will become infected and die from TB, so the variant will stay in the population.
B) TB is highly fatal, so those who are nonresistant will die quickly.
C) Humans are no longer evolving, so the population cannot develop widespread resistance.
D) It would be too expensive to genetically engineer people to give them the resistance gene.
A
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Which observation(s) of the medium ground finch (Geospiza fortis) by Peter and Rosemary Grant verify Darwin's selection hypothesis? Check all that apply.
_____ Considerable variation existed in the beak size and shape of this finch. _____ The medium ground finch showed assortative mating according to beak size and shape. _____ Beak shape (depth) varied with the dryness of the year. _____ Offspring were similar to parents in beak size and shape.
Which form of speciation is most rapid?
A. allopatric speciation on the mainland B. allopatric speciation on island archipelagos C. sympatric speciation via polyploidy D. sympatric speciation via disruptive selection E. sympatric speciation via character displacement
Which of the following best describes the rate of microbial death when treated with antimicrobial chemicals?
A. Cells in a population die at a constant rate. B. All cells in a population die at once. C. Some cells are never killed. D. The rate varies, depending on the species.
Failure to get adequate rest between workouts is often defined as:
What will be an ideal response?