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.

Question

Quizplus · Accepted Answer

The differences in physical and psychological characteristics in identical twins who developed from the same zygote but exhibit differences can be attributed to epigenetic changes. Epigenetic changes are modifications that occur in gene expression without any alteration in the DNA sequence. These changes can result from environmental factors, such as nutrition and stress. Therefore, the twins' experiences and environment can cause differences in their physical and psychological characteristics despite having identical DNA.

Sheena and Tina Are Identical Twins Who Developed from a Single