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 meiosis and mitosis are forms of cell reproduction. They both have a prophase and an anaphase. Both are forms of cell reproduction/. Both are forms of nuclear division. Meiosis occurs in generative cells and mitosis in somatic cells. Both meiosis and mitosis are forms of cell reproduction. They both have a prophase and an anaphase. Both are forms of cell reproduction/ Both are forms of nuclear division. Meiosis occurs in generative cells and mitosis in somatic cells.