According to Merriam-Webster, gender /includes/ the social & cultural aspects of sex. The exclusion of sex from gender is an extremely recent development that isn't widely accepted yet.
Also, motherhood and fatherhood are biologically gender-linked roles. They are measurable biological phenomena that tie strongly into your definition of gender.
Also, motherhood and fatherhood are biologically gender-linked roles. They are measurable biological phenomena that tie strongly into your definition of gender.