Which of the following best explains the figure?
A) Conspicuous behavior leads to high infection intensity.
B) High intensity infection leads to more conspicuous behavior.
C) There is no relationship between conspicuous behavior and infection intensity.
D) Only infected individuals exhibit conspicuous behavior.
B
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Natural selection results in organisms perfectly adapted to their environments
Indicate whether the statement is true or false.
In central Africa, the frequency of the sickle-cell allele has remained stable over the years because the allele protects against malaria. In the United States, malaria was eradicated by eliminating the mosquito that spreads the disease
The decreasing frequency of the sickle-cell allele in African Americans since malaria was eliminated in the United States is an example of A) stabilizing selection. B) genetic drift. C) the founder effect. D) disruptive selection. E) directional selection.
In male humans, crossing-over between the X and Y chromosomes occurs at the
a. male-specific region. b. ampliconic regions. c. X-transposed regions. d. X-degenerate regions. e. pseudoautosomal regions.
Amination is the addition of a(n) ________ group to a carbon skeleton.
A. phosphate B. carboxyl C. amino D. hydroxyl