Is tongue rolling recessive or dominant?

If the tongue rolling gene is recessive, then the mother's XX chromosome contains this gene, and the father has an X gene. Then Xiao Ming gets an X from his mother and an X containing the tongue rolling gene from his father, so he can roll his tongue.

note:

1. The tongue rolling gene is dominant, so it is easy to be misled when pushing.

2. As long as one parent has a dominant gene, it is possible to have this feature.

2. Parents with recessive genes may not have the characteristics of recessive genes, but their children may.