Oogenesis

Question 1

What is the first step of oogenesis

Answer 1

The oogonium (stem cell) goes through DNA replication [92]

Question 2

What happens before birth to produce 2 million primordial follies, each w/ a primary oocyte

Answer 2

Mitosis to make the [92] chromosome cell into 2 [46].

1 Of them becomes the primary oocyte that we follow

Question 3

The primary oocyte [46] goes through…

Answer 3

DNA replication first [92] and the meiosis 1 begins, but is arrested at prophase 1 (crossing over)

Question 4

What begins to happen after puberty

Answer 4

Each month 4-5 primordial follicles begin to develop into primary follicles the thecae and granulose cells produce estrogen.

Question 5

When is meiosis 1 finally completed

Answer 5

primary oocyte goes through meiosis 1 and ejects half the DNA into a small polar body so it now has [46] and is a secondary oocyte.

Question 6

when is meiosis 2 completed

Answer 6

Not until after fertilization. Once the sperm DNA comes in, half the eggs DNA will be ejected into a small polar body.