Gametogenesis Ppt Flashcards
• Process of creating gametes
Gametogenesis
Germ cells are set aside early in development
Migrate to the____
Undergo____ divisions to make haploid germ cells
gonad
meiotic
Process of producing sperm
Occurs in______ of the testes
Spermatogenesis
seminiferous tubules
• Process of producing oocytes
• Occurs in the____
Oogenesis
ovaries
___________ are the germ cells that will eventually develop into the mature sperm;
the first step in this development is the duplication of _______ to get ready for meiosis
Spermatogonia
homologous chromosomes
:the first meiotic division separates the homologous chromosomes from each parent
Primary spermatocyte
______: the second meiotic division separates the 2 chromatids and creates_____
Secondary spermatocyte
4 haploid cells
_____: Will produce 4 sperm cells by the process of______.
Spermatids
spermiogenesis
differentiate into the shape we commonly know
Sperm cells
produces sperm cells.
Meiosis
Diploid cells divide through mitosis in the linings of the____
Some of the daughter cells then undergo meiosis, producing_____ which differentiate into mature sperm cells.
seminiferous tubules
haploid spermatocytes
Sperm formation
spermatogenesis
have the normal diploid number of 23 chromosome pairs.
Primary spermatocytes
The large pair of chromosomes represents______
The X and Y chromosomes are____
autosomes (non sex chromosomes)
sex chromosomes
STRUCTURE OF SPERM
• SIZE:
0.006 cm (0.0023 inch)
STRUCTURE OF SPERM
•____
______:
- contains enzyme that help the cell penetrate the oocyte
•_____
______:
- energy for motility
•___
Head-Acrosome
Body or Midpiece-Mitochondria
Tail
are the germ cells that will eventually develop into the mature oocytes
Oogonia
: Undergoes the first meiotic division, separating homologous chromosomes
Primary oocyte
:the second meiotic division separates the 2 chromatids and creates 4 haploid cells
Secondary oocyte
Egg:
In females. it produces_____ and____.
This allows the egg to retain more________ to support early stages of development
1 egg (ovum)
3 polar bodies
cytoplasm
______in a female produces a secondary oocyte and a polar body.
Meiosis
Unequal division enables the cell destined to become a fertilized ovum to accumulate most of the cytoplasm and organelles from the primary oocyte, but with only ______copy.
one genome
The_____ accumulates abundant cytoplasm that would have gone into the meiotic product that became the polar body if the division had been equal.
oocyte
Ovum formation
oogenesis
Primary oocytes - have the
diploid number of 23 chromosome pairs
T or F
Meiosis in females is UNEVEN, concentrating most of the cytoplasm into one large cell called an oocyte for egg.
True
The other products of meiosis, called_____, contain the other three sets of chromosomes and normally degenerate
polar bodies
What happens with Polar bodies?
• By end of meiosis II you have a total of____ polar bodies
•____ by the woman’s body
• Rarely fertilized by the sperm
- If fertilized will become a____
3
Absorb
blighted ovum
Before birth millions of Oocytes arrest in
PROPHASE I
Puberty:_____ oocytes remains
400,000
After puberty: ____continues and halts at_____
meiosis I
Metaphase II
Penetration of _____completes female meiosis
oocyte membrane
• A female ovulates about___ oocytes between puberty and menopause
400
