So it's the mother centriole that can develop into the basal body. And the basal body is basically the structure in the cell that is responsible for forming cilia as well as flagella. And cilia and flagella are two types of specialized structures that basically allow the cell to move. They mobilize the cell. So we see that although centrioles are not exactly necessary for the survivor of the individual cell the centrioles and centrosomes are necessary for the survival of the organism as a whole. For example, if we examine a specific type of cell that needs flagella our sperm cells.