Fill in the Blank Questions 36.Genes known as _________ encode proteins that stimulate cell division. 37.Mutated proto-oncogenes become cancer-causing genes called _________. 38.Pairs of chromosomes that have the same size, shape, and function are ________________________________. 39.During mitosis, chromosomes are lined up at the equator of the cell during this phase _________________________. 40.Cytoplasm is cleaved in two during the _____________________ phase of the cell’s life cycle. Â Â