Most density-dependent factors show negative feedback relative to population size. Which one of the following is more likely to show positive feedback relative to population size?
A. competition in small populations
B. competition in large populations
C. fecundity in small populations
D. fecundity in large populations
E. mortality in large populations
C. fecundity in small populations
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In cocker spaniels, black coat color (B) is dominant
over red (b), and solid color (S) is dominant over spotted (s). If a red, spotted male is crossed with a black, solid female and all the offspring from several crosses expressed only the dominant traits, the genotype of the female will be a. BB SS. b. Bb SS. c. Bb Ss. d. BB Ss. e. none of these.
When examining the complete genome sequence of E. coli 0157:H7, a researcher notes that only one of two possible codons coding for lysine is observed in the genome. This is likely the result of:
a. mutational bias. b. this gene being highly expressed. c. unequal abundances of transfer RNA. d. selection against slip-stand mutations. e. All of the above.
Which of the following processes does not contribute to the exchange in capillary beds of substances between the blood and the tissues?
a. Active transport by white blood cells b. Endocytosis and exocytosis c. Diffusion d. Blood pressure at the arterial end of a capillary e. Bulk flow through pores in the capillary wall
Farmers and horticulturalists have bred broccoli, cauliflower, kale, and cabbage from the wild mustard plant through
A. genetic drift. B. evolution. C. natural selection. D. sexual selection. E. artificial selection