My favorite, lysosomes. These break down old cells parts and remove waste. They do this by releasing enzymes that can break down food particles, old cell parts and engulfed bacteria and viruses. Did you know that if the cell knows its health is poor the lysosome will kill the it's own cell.
If gametes were produced instead by mitosis each gamete would be diploid not haploid. During fertilization of diploid gametes, the zygote would become 4n=92. With each new generation the number of chromosomes would double.