In humans the most common type of anthrax disease is
A. gastrointestinal anthrax resulting from consumption of undercooked food contaminated with spores.
B. pulmonary anthrax from inhalation of spores attached to dust.
C. tick borne anthrax resulting from direct introduction of vegetative Bacillus anthracis to the blood stream of a host.
D. cutaneous anthrax resulting from the introduction of spores into a break in the skin.
Answer: D
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About 80% of the alleles present in thoroughbred horses can be dated back to 31 known ancestors from the late eighteenth century. As a result, one would expect _____
A. random mating. B. Hardy-Weinberg equilibrium. C. low rates of mutation. D. many polymorphic alleles. E. little variation in physiology and behavior.
A mule is an example of
a. hybrid breakdown. b. hybrid inviability. c. hybrid sterility. d. mechanical isolation. e. temporal isolation.
You are planning an experiment to find out whether the rate at which water freezes depends on the shape of the container. What is the independent variable?
A.) shape of the container B.) rate at which water freezes C.) amount of water
A population of mountain-dwelling salamanders migrates and splits into two populations separated by a valley they can not cross. The speciation process that may occur is:
A) temporal. B) sympatric. C) behavioral. D) allopatric.