Sheena and Tina 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)epigenetic changes.
C)allele variation.
D)genotypic changes.

Question

Quizplus · Accepted Answer

Epigenetic changes can influence gene expression and can vary between individuals, even between identical twins who share identical DNA. These changes can result from environmental factors, lifestyle choices, and other factors that can affect gene expression. Therefore, differences in physical and psychological characteristics between identical twins can be due to epigenetic changes. Option A is incorrect because identical twins have the same genetic blueprint. Option C is incorrect because allele variation occurs when individuals have different forms of a gene at a particular location, but identical twins have the same gene variants. Option D is incorrect because genotypic changes refer to alterations in an individual's genetic material, which is not the case for identical twins.

Sheena and Tina Are Identical Twins Who Developed from a Single