About one-third of the retail trade industries â $7.5 million in average annual receipts. A few, such as grocery stores, department stores, motor vehicle dealers (except new car dealers) and electrical appliance dealers have a higher size standard, ranging from $11 million to $38.5 million in average annual receipts.
spindle fibers. Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis. During mitosis, the spindle fibers are called the mitotic spindle.
During this stage, the microtubules, or spindle fibers, pull the homologous chromosomes apart and move them to opposite ends of the cell. Telophase I is next. Here the spindle fibers are broken up, new nuclear membranes form, the chromosomes uncoil, and the cell divides into two daughter cells. The next phase of meiosis is called Meiosis II. This begins with prophase II. During this stage the chromosomes condense once again, the nuclear membrane breaks down, and the spindle apparatus forms in each of the two new cells. This is followed by metaphase II. Here the spindle fibers attach to the chromosomes and again align them at the middle of the new cells. Next, during anaphase II, the sister chromatids are pulled to opposite ends of the cells, and the cells elongate.