Final answer:
Gender identity and expression were added as grounds of discrimination in the OHRC in 2012.
Step-by-step explanation:
The addition of gender identity and expression as grounds of discrimination in the Ontario Human Rights Code (OHRC) occurred in 2012. Prior to this change, LGBTQ individuals did not have explicit protection against discrimination based on their gender identity and expression in Ontario. This amendment was an important step towards ensuring equal rights and protections for all individuals, regardless of their gender identity or expression.