Answer: The answer for the blanks are- Chromosome present in the nucleus.
Cell division is a process of forming two or more daughter cells from a parent cell. Mitosis is one of the types of cell division by which a parent cell forms two identical daughter cells, possessing same number of chromosomes as their parent cell.
The instruction for cell division are found in the chromosome ( threadlike structures formed of DNA, which is the genetic material of the cell).
These structures are present in the membrane bound specialized organelle of eukaryotic cell, called nucleus.