Question

when examining cells in the lab, you notice that a particular tissue sample has 45% of the cells in the mitotic phase, how do you explain this observation?

Answer 1

This means that the tissues are most likely from the bone marrow or the epithelium in animals or meristem tissue in plants.  These tissues are constantly renewing themselves hence most cells are in mitosis stage. Tissues that are less likely to have such a high number of cells in the mitotic state are bone, connective, and nerve tissues.