Question

Have studies of twins suggested that there is or is not a biological component to our gender identity?

There is or there is not

Answer 1

It's not entirely genetic, but there's a pretty strong basis of genetics that play a role.

Step-by-step explanation:

What makes you feel like a male or female is complex and involves interactions between many different genes, much like height, weight or blood pressure. However, while genes play a role, they are not the only factors involved in determining gender identity. It is speculation … they don't have evidence of under-masculinisation, or feminisation.