Phenylketonuria (PKU) is an example of
a. the interaction between genes and environment.
b. a disorder caused by a dominant allele.
c. a chromosomal abnormality caused by an extra chromosome.
d. a disorder whose effects cannot be changed by the environment.
a
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What have researchers concluded from research on the concordance rates of monozygotic (MZ) and dizygotic (DZ) twins?
a. The role for genetics is much larger for males than it is for females. b. Genetic factors play a small role in etiology of alcoholism among women. c. Similar concordance rates for MZ and DZ twins suggest no significant role for genetics. d. Concordance rates suggest a role for genetics, and higher concordance rates among males reflect the higher prevalence of alcoholism among males.
In order for a diagnosis of Alzheimer's disease to be definitively made __________.
A. brain tissue must be examined upon autopsy B. symptoms must be present for over two years C. the afflicted individual must exhibit delirium at least 50 percent of the time D. plaques and tangles must be visible on an MRI