Gina and tina are identical twins. gina has had a series of traumas and has been diagnosed with schizophrenia. tina is demonstrating no symptoms of schizophrenia. because schizophrenia tends to run in families, the difference between the twins can be explained through

Their case could simply be explained through epigenetics. In a nutshell, epigenetics suggests that environmental factors can alter the genes. Although the twins share the same genes, the traumas experienced by Gina may have altered a part of her genes, which led to her developing schizophrenia.