It is only certain that, unless something goes wrong, each daughter cell will have one of each chromosome. This is called independent assortment . But , during meiosis, chromosomes exchange parts of their genetic material with the corresponding regions on their homologous chromosome. This process is called crossing over and it makes the number of possible combinations nearly unlimited. The haploid cells which result from meiosis, in animals, are gametes.
Diploidy is restored when opposite gametes combine at fertilization.
It results in genetic variation in populations greater than that which might result from independent assortment alone. The stage of an organism's development in which tissues and organs develop beginning with a fertilized egg. In animals, a haploid cell which results from the second stage of meiosis. In plants, the haploid cells proceed through an intermediate, multicellular stage before producing gametes. A cell with only a single copy of each chromosome.