Susan and Betty Are Monozygotic Twins,whereas Ming and Li Are

Multiple Choice

Susan and Betty are monozygotic twins,whereas Ming and Li 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) Ming and Li are more concordant than are Susan and Betty.
B) Susan and Betty are more concordant than are Ming and Li.
C) Given similar environments,the two sets of twins are equally concordant.
D) It is not possible to determine concordance from studying twins.