Darius and Xavier Are Identical Twins

question 4

Multiple Choice

Darius and Xavier are identical twins. At age 20, Darius was diagnosed with cancer but recovered with treatment. The two men are now 50 years old and Xavier has never been diagnosed with cancer. What concept might explain this difference?

• A) Gene therapy
• B) Genetic transmission
• C) Epigenetics
• D) Evocative expression
• E) Passive expression

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