In a study of twins, a researcher finds that 40 percent of dizygotic (DZ) twins and 40 percent of monozygotic (MZ) twins share a trait. What is the researcher most likely to conclude about the trait?
a. It is 40 percent concordant.
b. It is 60 percent concordant.
c. It is genetically determined.
d. It is not genetically determined.
Answer: d.
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