If a cell had 12 chromosomes, how many chromosomes will each daughter cells have after mitosis and cytokinesis

12 chromosomes in each cell.

Explanation:

Mitosis is a form of cellular division that produces two identical daughter cells, each having the same number of chromosomes as the parent cell.

This happens because a cell replicates it's chromosomes before dividing (this occurs in interphase), creating two sister chromatids. These chromatids then get separated in anaphase, producing two daughter cells, each with the same number of chromosomes as the parent cell.

I've attached an image which should hopefully explain how this happens. :)

the correct answer is b

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.