Which describes brightly colored peacocks mating more frequently than drab peacocks?
A) artificial selection
B) directional selection
C) stabilizing selection
D) disruptive selection
E) sexual selection
Ans: E) sexual selection
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Compared to more distantly related taxa, the DNA sequences of two closely related taxa is expected to show:
A. fewer differences because mutation rates are relatively constant and recently diverging species have had less time to accumulate differences. B. fewer differences because mutation rates slow down during speciation events so that recently diverging species have fewer mutations. C. fewer differences because mutation rates are highly variable and it is just by chance that recently diverging species accumulate fewer differences in DNA sequences. D. greater differences because mutation rates are relatively constant and recently diverging species have had more time to accumulate differences. E. greater differences because mutation rates accelerate during speciation events leading to greater changes in DNA sequences.
The phases of each PCR cycle listed in order are ____
a. denaturation, extension, and annealing b. annealing, extension, and denaturation c. extension, denaturation, and annealing d. annealing, denaturation, and extension e. denaturation, annealing, and extension
The continental rise is composed of sediments deposited from:
a. biological activity. b. underwater landslides. c. midocean ridges. d. windblown sources. e. cosmogenous sources.
The evolution of saber teeth in a both extinct carnivorous mammals and marsupials is an example of
A. homology caused by common descent. B. homology caused by convergence. C. homoplasy caused by common descent. D. homoplasy caused by convergence. E. homoplasy caused by evolutionary reversal.