The aura can be in the form of prismatic colors, flashes of light, and sometimes stars. They usually last about 20 minutes and then go away. If these flashes or lines of light occur without a headache, it is called an ophthalmic migraine, or a migraine without a headache.
In gymnosperms and flowering plants, the megaspore is produced inside the nucellus of the ovule. During megasporogenesis, a diploid precursor cell, the megasporocyte or megaspore mother cell, undergoes meiosis to produce initially four haploid cells (the megaspores).
Mitosis and Meiosis are two ways cells reproduce.   Mitosis is asexual cell division. DNA duplicates it self.  Centrioles separate and a spindle forms. Chromosomes separa â¦ te on  the spindle.Then the cell closes up making two diploid cells.itosis and Meiosis are two ways cells reproduce.   Mitosis is asexual cell division. DNA duplicates it self.  Centrioles separate and a spindle forms. Chromosomes separa â¦ te on  the spindle. Then the cell closes up making two diploid cells.