Compared to egg cells, the number of cell divisions in sperm is more variable and shows a slight correlation with calendar time. The male line sees, for example, 40 divisions per generation in fruit flies versus perhaps ten times that in humans. Nevertheless, this is still dwarfed by the difference in generation times. Incidentally, the fact that men’s sperm undergoes over ten times as many rounds of cell division than women’s eggs means that most human mutations trace back to fathers, more specifically to their testicles, where the majority of germ cell division takes place.
