The mode of natural selection in which two or more extreme phenotypes are fitter than the intermediate phenotype is
A. directional selection.
B. stabilizing selection.
C. disruptive selection.
D. artificial selection.
E. uniformitarianism.
Ans: C. disruptive selection.
You might also like to view...
Which of the following statements about RNA processing in eukaryotes is INCORRECT?
A. The excision of introns from pre-mRNA is the only modification required to produce a mature mRNA. B. A protein/RNA complex is used to remove introns from the pre-mRNA. C. A poly A tail is added on to the 3? end of the mRNA. D. A 7-methylguanosine cap is added on to the 5?end of the mRNA. E. Modification occurs in the nucleus.
Which term refers to muscles that are attached to bones, and cause bones to move at their joints when they contract?
A. smooth muscles B. skeletal muscles C. cardiac muscles D. ligament tissues E. involuntary muscles
Identify three of the five basic themes in biology:I
The cellular composition of life II. The evolution of life III. The interactions of living systems IV. The mechanisms of disease V. The transmission of information a. I, II, and III b. II, III, and IV c. III, IV, and V d. I, IV, and V e. II, III, and V
Several cases of nonbloody diarrhea with nausea, fever, and abdominal pain have occurred among a number of people who ate at the same restaurant. Public health officers find a food sample containing motile noncoliform, Gram-negative bacteria capable of metabolizing glucose. The "food poisoning" resulted from contamination with:
A) Yersinia B) E. Coli C) Citrobacter D) Shigella E) Salmonella