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).
Both diploid and haploid cells can undergo mitosis. This makes a lot of sense, because mitosis is essentially like making a photocopy: it creates a perfect reproduction of what you started with. Therefore, if a diploid cell undergoes mitosis, the result is two identical diploid cells (2n â2n).f a haploid cell undergoes mitosis, which is something certain types of plant and fungus do as part of their normal life cycles, the end result is two identical haploid cells (nân). In meiosis, however, you start with a diploid cell that divides twice to produce four haploid cells.