Question

During which phase of mitosis do the nuclear membrane, nucleolus, and nucleus dissolve?

Answer 1

The thired phase. I hope this helps.

Answer 2

It is during prophase of mitosis when the DNA condense and nucleus dissolves, the dissolve of the nuclear membrane signals the prometaphse of mitosis. 

But that is only based on the university level, in high school level, we classify all nuclear membrane, nucleolus and nucleus dissolve during prophase of mitosis.

Hope this helps!<span />