Why Are Dizygotic Twins Less Likely to Show Concordance for a Monogenic

question 5

Multiple Choice

Why are dizygotic twins less likely to show concordance for a monogenic trait than monozygotic twins?

• A)Dizygotic twins share fewer allele sequences in common than monozygotic twins.
• B)It is possible for dizygotic twins to have different fathers, and monozygotic twins always have the same father.
• C)Gene expression in monozygotic twins is less influenced by environmental factors than that of dizygotic twins.
• D)Because of their identical appearance, monozygotic twins are more likely to be raised together and share a common environment than are dizygotic twins.

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