oogenesis

step one

diploid cells containing chromosomes join at the centromere and freezes until puberty is hit

step two

once menstrual cycle starts, the joint chromosomes combine and swap portions of their chromosomes with each other

step three

the chromosomes get pulled apart and split into two cells, with one getting most genetic material, and the other getting less, called the polar body

step four

polar body is discarded by body

step five

the cell with most genetic material is the egg and is either fertilized or expelled by body

step six

if fertilised, the egg is split up and turns into two haploid cells, one being a polar body, and the other turns into a larger cell where the sperms chromosomes break down and combine with the eggs chromosomes