The mating displays of a male mallard duck do not attract a female pintail duck. This is an example of
A. seasonal isolation.
B. behavioral isolation.
C. habitat preference.
D. geographic isolation.
B. behavioral isolation.
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Height, weight, and eye color are examples of
phenotypes that illustrate all BUT a. polygenic inheritance. b. continuous variation. c. pleiotropy. d. the action of several gene pairs each with additive effects. e. the cumulative effect of several gene products acting to determine phenotype.
As a bacterium approaches a food source, one would expect
a. runs to become more frequent. b. flagella to stop spinning. c. tumbles to become more frequent. d. flagella to rotate clockwise more frequently.
Patients who suspect exposure to rabies are
A) injected with the attenuated vaccine. B) injected with both antirabies antibodies and the inactivated vaccine. C) injected with both antirabies antibodies and the attenuated vaccine. D) injected with antirabies antibodies. E) injected with the inactivated vaccine.
The rough endoplasmic reticulum is studded with:
a. ribosomes b. vacuoles c. nucleoli d. proteins