Susan and Betty are monozygotic twins, while George and Brent are dizygotic twins. If a particular trait is determined primarily by hereditary factors, what would be the relative degree of concordance in these two twin pairs?
A. George and Brent would be more concordant than Susan and Betty.
B. In similar environments, the two sets of twins would be equally concordant.
C. It is not possible to determine concordance from studying twins.
D. Susan and Betty would be more concordant than George and Brent.
Answer: D
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