Question

which step of mitosis involves the nucleus splitting and nuclear membranes forming around each new nucleus

Answer 1

Nucleus splitting or DNA splitting is in Anaphase !!

and The new nuclear memb is formed during the Telophase of Mitosis !! But it continues till cytokinesis !!

so answers are Anaphase and Telophase !!

Answer 2

Step-by-step explanation:

Mitosis actually happens in four phases. The first phase of mitosis through which chromatin condenses into chromosomes, the nuclear case breaks down, centrioles divide, and a spindle begins to form. Microtubule fibres that enable the division of sister chromatids during mitosis and meiosis.