(Solved): The diagram below shows the expansion of a cell population, starting with a singular stem cell (whi ...

The diagram below shows the expansion of a cell population, starting with a singular stem cell (white circle). The cellular pool concludes with a mix of differentiated progenitor cell (gray circle) and stem cells. For each division shown (there are 6 in total), indicate whether the division is asymmetrical or symmetrical. How do asymmetric and symmetric cell divisions establish the nervous system? When are each of those predominantly taking place (early vs late development)?