Question

Identical twins Jada and Olivia were very similar in personality throughout childhood. After high school, Jada majored in music and became an elementary school teacher, while Olivia earned a medical degree and joined Doctors Without Borders, traveling to countries gripped by war and epidemics. Later in life, Olivia was more prone to risk-taking than Jada. This difference in personality is a result of

A)niche-picking.

B)alterations to Olivia's chromosome-5 gene.

C)mutations in Olivia's DD genetic makeup.

D)methylation.

Answer

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