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)pruning of unused neurons in each child's brain.
C)allele variation.
D)epigenetic change.

Question

Quizplus · Accepted Answer

Epigenetic change refers to changes in gene expression without changes to the underlying DNA sequence. These changes can be influenced by environmental factors and can lead to differences in physical and psychological characteristics between individuals who have identical DNA.

Mark and Mathew Are Identical Twins Who Developed from a Single