FIGURE 3-23 A Clone and Her Mom Copycat (left) and Rainbow (right), the cat that donated the cell nucleus for cloning. Although the cats’ genomes are identical, their phenotypes, including fur color, differ. One copy of the X chromosome is randomly inactivated in each cell, which explains the color differences. Even clones are subject to phenotypic plasticity: they retain the capacity to develop into more than one phenotype.

Photos used with permission from Texas A&M College of Veterinary Medicine & Biomedical Sciences.