Meiosis is central to the processes by which diploid microspore mother cells within the anther give rise to haploid pollen grains .
Megaspore mother cells in ovules that are contained within the ovary give rise to haploid nuclei .
Meiosis is central to the processes by which diploid microspore mother cells within the anther give rise to haploid pollen grains , and megaspore mother cells in ovules that are contained within the ovary give rise to haploid nuclei .