If we say that bipolar disorder has a concordance rate of 85 percent in monozygotic twins, we mean that
a. 85 percent of the time bipolar disorder is the result of genetic influences shared by monozygotic twins.
b. if one monozygotic (identical) twin has bipolar disorder, his or her twin has an 85 percent chance of being diagnosed with the disorder as well.
c. 85 percent of the time, bipolar disorder cannot be explained by genetic variables, even in monozygotic twins.
d. a parent with bipolar disorder has an 85 percent chance of passing the disorder to his or her monozygotic twins.
Question 2
Fraternal twins share
a. more genes than non-twin siblings but fewer genes than identical twins.
b. about the same number of genes as non-twin siblings.
c. about the same number of genes as identical twins.
d. fewer genes than non-twin siblings.
Acromegaly in one individual from a pair of identical twins.
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