I need their definitions, functions, locations, and why they exist that way.
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here's a diagram depicting the process of oogenesis (egg-production)
this process is halted at the secondary oocyte stage until it is fertilized by sperm, at which point it'll divide once more, resulting in a fertilized ovum and a polar body. The polar bodies are different in the ovum in that they have little cytoplasm, since all of it needs to go to one in order for a zygote to be produced. At this point all are in the ovary...definitions:
secondary oocyte
n.
An oocyte in which the first meiotic division is completed. The second meiotic division usually stops short of completion unless fertilization occurs.
polar body
n.
Either of two small cells formed by the ovum during its maturation, the first usually released just before ovulation and the second not until after the ovum has been discharged from the ovary and penetrated by a sperm cell.
this process is halted at the secondary oocyte stage until it is fertilized by sperm, at which point it'll divide once more, resulting in a fertilized ovum and a polar body. The polar bodies are different in the ovum in that they have little cytoplasm, since all of it needs to go to one in order for a zygote to be produced. At this point all are in the ovary...definitions:
secondary oocyte
n.
An oocyte in which the first meiotic division is completed. The second meiotic division usually stops short of completion unless fertilization occurs.
polar body
n.
Either of two small cells formed by the ovum during its maturation, the first usually released just before ovulation and the second not until after the ovum has been discharged from the ovary and penetrated by a sperm cell.