As natural selection acts on a trait in a population, how will the amount of variation associated with that trait in the population change?
A) Variation will decrease.
B) Variation will increase.
C) Variation will remain the same.
D) Variation will disappear altogether.
A
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The material responsible for transformation was shown to be DNA by
A. Watson and Crick. B. Avery, MacLeod, and McCarty. C. Lederberg. D. Stanley.
The results of the butterfly experiment
a. supported the hypothesis. b. provided valuable quantitative data. c. confirmed the prediction. d. provided evidence of natural selection in action. e. all of these.
The competitive exclusion principle assumes that the
A) competing species have different resource requirements. B) competing species have the same carrying capacity (K). C) environmental conditions remain constant. D) superior competing species will have a lower population growth rate than the inferior competitor.
A lack of which molecule would result in a cell's inability to "turn off" genes?
A) operon B) inducer C) promoter D) corepressor