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).
User: Which process MUST occur before mitosis and meiosis, produces two identical DNA strands from one original template, and uses DNA polymerase enzyme to produce the copy?Weegy: The process you are referring to is DNA replication. However, meiosis must always occur before mitosis.So the correct process is DNA replication, meiosis and then mitosis. Expert answered|AshleyRose|Points 0|User: Immature bone cells, or osteoblasts, manufacture a protein called osteoid as well as several hormones.owever, meiosis must always occur before mitosis. So the correct process is DNA replication, meiosis and then mitosis. Expert answered|AshleyRose|Points 0|User: Immature bone cells, or osteoblasts, manufacture a protein called osteoid as well as several hormones.