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Mark and Mathew Are Identical Twins Who Developed from a Single

Question 240

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Mark and Mathew are identical twins who developed from a single zygote and 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) the pruning of unused neurons in each child's brain.
C) allele variation.
D) epigenetic change.

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