Which type of cell division occurs in the gonads?

If a cell has $10$ chromosomes at the anaphase stage of mitosis,how many chromosomes should a diploid cell have in this stage?

$(1)$ Give scientific reason: Meiosis is called reductional division.
$(2)$ Give scientific reason: Mitosis is necessary for growth,development,and repair of the cell.

In which of the following does mitosis not occur?

Which of the following statements are correct?
$a -$ Cell cycle duration can vary from organism to organism and also from cell type to cell type.
$b -$ $DNA$ synthesis occurs only in pachytene.
$c - G_1$ phase corresponds to the interval between mitosis and initiation of $DNA$ replication.

Select an incorrect statement with respect to the cell cycle.