Oogenesis
What is the cell starting meiosis called?
The primary oocyte
The primary oocyte begins the first meiotic division but is arrested in which phase?
Prophase 1
At the time of birth, all future eggs are in which stage?
Prophase
At puberty, the primary oocyte finishes the _______ division.
First
Explain unequal division in oogenesis.
The cell divides unequally, with most of the cellular material and organelles going to one cell. This cell is called the secondary oocyte. Only one set of chromosomes and little cytplasm goes to the other cell, the polar body, which later degenerates.
The secondary meiotic arrest occurs at which stage?
Metaphase 2
When is the secondary oocyte released from the ovary?
Ovulation
When the secondary oocyte is released from the ovary, what is possible?
Meiosis 2 if fertilized
If fertilized, what happens to the cell?
If fertilized, the cell continues through meiosis 2. It completes meiosis and produces a second polar body and the fertilized egg with all 46 chromosomes, half coming from the sperm.
The primary oocyte arrests in ________. The secondary oocyte arrests in _________.
Prophase 1
Metaphase 2