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).
Before a cell can undergo mitosis, it must replicate its entire genome because when the cell divides each daughter cell will need a complete set of chromosomes 2. Mitosis occurs in five phases: prophase, prometaphase, metaphase, anaphase, and telophase, which are followed by cytokinesis, which is when the cytoplasm is divided between the two daughter cells 1. A pictoral representation of Mitosis, each cell depicts a different phase: 1) Prophase, 2) Prometaphase, 3) Metaphase, 4) Anaphase, 5) Telophase, 6) Cytokinesis. What are the individual steps of mitosis? At the beginning of prophase, the first stage of mitosis, the DNA condenses into chromosomes. Each chromosome consists of two chromatids.