Sheena and Tina Are Identical Twins Who Developed from a Single

question 448

Multiple Choice

Sheena and Tina are identical twins who developed from a single zygote and who share identical DNA. Nevertheless, as they develop, differences in physical and psychological characteristics become evident. These differences are due to:

• A) each twin's unique genetic blueprint.
• B) epigenetic change.
• C) allele variation.
• D) genotypic change.

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