Oogenesis - Secondary Oocyte Flashcards
0
Q
What is the ploidy number of secondary oocyte?
A
2N
1
Q
When does a secondary oocyte form?
A
Forms just prior to ovulation as meiosis I is complete
2
Q
What is the chromosomal content of secondary oocyte?
A
contains 23 double-chromatid chromosomes
3
Q
What is the first polar body?
- What happens to it?
A
- Due to unequal cytoplasm distribution during meiotic division
- First polar body degenerates pretty quickly
- Carries away the extra chromatin resulting from the first meiotic division
4
Q
At what meiotic stage does the secondary oocyte arrest?
A
Development progresses to metaphase II and arrests until sperm penetration
5
Q
When does the secondary polar body form?
A
after sperm penetration
6
Q
When does the secondary oocyte complete meiosis II to become a mature ovum (1N)?
A
after sperm penetration
