Pinworm disease is caused by
a) Taenia solium.
b) Echinococcus granulosus.
c) Necator americanus.
d) Enterobius vermicularis.
Answer: d) Enterobius vermicularis.
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An example of a phenotypic trait where observation of phenotype can easily identify the genetic variation is:
A. color markings in certain invertebrates. B. human skin color. C. human blood type. D. color markings in certain invertebrates and human blood type. E. human skin color and blood type.
Who is a carrier of an X-linked trait?
a. homozygous dominant female b. heterozygous female c. homozygous recessive female d. homozygous male e. heterozygous male
What might cause a uniform population distribution?
A) Competition for resources B) The need to find a mate C) Scarce resources D) The need for a group to care for its offspring E) The need to hunt in a group
Under identical atmospheric conditions, freshwater _____
A) has more oxygen than seawater B) has less oxygen than seawater C) can hold 10-40 times more carbon dioxide than air D) can hold 10-40 times more oxygen than air