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).
In Biology. Answer   reproductive cells or you can also say the 23rd pair in the chromosome of the reproductive cell under goes the meiosis and the 23rd pair is called sex chromosome â¦ Germ cells are the only cells that can undergo meiosis as well as  mitosis.n Biology. Answer   reproductive cells or you can also say the 23rd pair in the chromosome of the reproductive cell under goes the meiosis and the 23rd pair is called sex chromosome â¦ Germ cells are the only cells that can undergo meiosis as well as  mitosis.