In Fig. 10b the chromosomes are seen paired and ready for the first division; that is, for the formation of the first polar body.
In the meantime, typically, a third polar body is formed by division of the first.
The discovery by Btschli of the spindle and its relation to the polar body has been of very great value.
In consequence both remain in the egg or both pass into the polar body.
At one point is situated a polar body and usually at the pole opposite to it a corresponding prominence.
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.
|polar body |
One of the small cells that are produced during the development of an oocyte and ultimately degenerate. A polar body contains one of the nuclei derived from the first or second meiotic division but little or no cytoplasm. See Note at oogenesis.