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?

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Quizplus · Accepted Answer

Monozygotic twins are genetically identical because they came from a single fertilized egg that split into two, while dizygotic twins developed from two separate eggs and have only 50% of their genes in common. Therefore, monozygotic twins have a higher degree of genetic similarity than dizygotic twins. If a trait is determined primarily by hereditary factors, monozygotic twins are more likely to be concordant (i.e., to share the trait) than dizygotic twins. Thus, Susan and Betty, being monozygotic, would be more concordant than Ming and Li, who are dizygotic.

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