In E. granulosus infections, the hydatid cysts usually occur in which organ?
a. Stomach
b. Brain
c. Intestines
d. Liver
D
The majority of the hydatid cysts occur within the liver. Cysts in the liver cause chronic abdo-minal pain and allergic reactions and may result in cholangitis, which is infection of the common bile duct, and cholestasis, which is interference with the flow of bile from the liver. Cysts that develop in the lungs may cause infections and abscesses and result in chronic cough, a shortness of breath, and chest pain.
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In tigers, a recessive allele causes a white tiger (absence of fur pigmentation). If one phenotypically normal tiger that is heterozygous is mated to another that is phenotypically white, what percentage of their offspring is expected to be white?
A) 50% B) 75% C) 0% D) 100% E) 25%
Because oxygen is more electronegative than hydrogen, the water molecule is:
A. hydrophobic. B. hydrophilic. C. nonpolar. D. ionic. E. polar.
What is the key concept addressed by the question?
What will be an ideal response?
Explain how epigenetic inheritance (for example, DNA methylation) can result in different phenotypes observed in
identical twins (who have identical DNA sequences). What will be an ideal response?