Oogenesis

Oogonia

diploid cells that turn into primary oocytes in oogenesis

23

how many chromosome pairs in oogonia

 early embryonic life

oogonia are created in __________ All have turned into oogonia at late fetal age

oocytogenesis

proces of ___________ turn oogonia to primary oocyte

meiosis I

When__________ is completed, one secondary oocyte and one polar body is created

1 secondary oocyte

1 polar body

after meiosis 1 the primary oocyte splits into :

Phrophase 1 of Meiosis 1 / dictyate

The stage where immature ova spend most of their lifetime

dictyate

the halt in meiosis 1 of primary oocyte is called?

55 years

immature ovum can spend up to ________as a primary oocyte until the last ovulation before menopause

Secondary oocyte

cell that is formed by meiosis I in oogenesis

Secondary oocyte

The _________Continues/begins meiosis II.

1 ootid

1 polar body

The daughter cells of the secondary oocye are:

metaphase II

Meiosis II is halted at _________unless fertilization occurs.

ootid

immature ovum (shortly after ovulation) to fertilization (turns into an _____)

ootid

second polar body

Daughter cells of meiosis II:

secodary oocyte

largest cell in the human body

days

the lifespan of secondary oocyte is Measured in ______ from ovulation until either fertilization or degeneration

ootid

Haploid result of completion of Ootidogenesis | meiosis II (after fertilization triggers it).

minutes

• before complete maturation of ootid into an ovum the time spent as an ootid is measured in________

ovum

• The ootid matures into an_____

meiosis II

Ootid matures into an ovum immediately after ______is complete.

Fetus at 20 weeks , 6-7million

Oogenesis is at its peak → ~______ _____ primary oocytes.

after birth

Number of oocytes drops to ~1–2 million; all are primary oocytes in dictyate arrest this happens _______

Reproductive life

Oocytes mature monthly; ovum forms only if fertilization occurs this happens during? ____________

childhood

when is ovary inactive

20 weeks AOG 7 million

oocytogenesis occurs at ________

Fertilized

Meiosis II is completed only when ________

1. primordia follicle

2. primary follicle

3. growing follicle

4. mature/ grafian follicle

5. ovulation

6. corpus luteum

enumerate process of follicle development

meiosis II

Completion of _____converts secondary oocyte into a fertilized egg or zygote and also a second polar body

sexually mature

No further development occurs until years later when the girl becomes _______