biological explanation

• Gender identity disorder occurs when an individual believes that their biological sex is not in accordance with their gender, and so they choose to identify with the opposite gender. The distress and anxiety that comes from this means that GID is considered a psychological disorder.
• Genetic explanations have mainly focused on twin studies, as suggested by Coolidge et al (2002). These researchers found that GID occurred in 2.3% of 157 pairs of twins and that over half of such a prevalence could be explained by genetics. Considering that MZ twins share 100% of genes with each other, whilst DZ twins are 50% of their genes, this is also indicative of a biological/genetic basis for GID.
• Neural explanations suggest people with gender dystoria may have brains that are more closely resemble the opposite sex.