gametogenesis Flashcards
1
Q
gametogenesis
A
- formation of mature gametes
- meiosis
2
Q
spermatogenesis
A
- mature haploid sperm are produced
- everyday
- begins at puberty
3
Q
phases of spermatogenesis
A
- multiplying phase : spermatogonia of germinal epithelium divide by mitosis
- growth phase : mature and grow into primary spermatocytes
- reduction phase : meiosis to become haploid
- differentiation phase : lose unnecessary cell organelles and cytoplasm
- 72 days from spermatocyte to immature sperm
- moved to epididymis to mature
4
Q
sperm
A
- acrosome : hydrolytic enzymes to digest outer layer of egg
- nucleus : haploid set of chromosomes
- head
- mitochondria : provide energy to move
- body
- contractile fibers : whip of tail
- tail
- 0.05mm length
- survive 48 hours in female reproductive tract
5
Q
oogenesis
A
- production of haploid mature eggs
- number of eggs determined before birth (oogonia mitosis)
- starts at puberty, stops at menopause
- monthly cycle
6
Q
phases of oogenesis
A
- multiplying : oogonium mitosis
- growth phase : primary follicles periodically grow (form Graafian follicles); oogonium grow into primary oocyte
- reduction and maturity phase : primary oocyte meiosis; 1 nuclei will dominate and the others degenerate; mature graafian follicles move periodically to ovary
7
Q
what is ovulation?
A
- release of mature eggs
- 28 days
- 24 hour survival after ovulation
8
Q
egg
A
- zona pellucida (jelly layer)
- haploid nucleus (genetic material of mother)
- cytoplasm (egg cell alive)
- follicle cells (nourishes egg)
- 0.02 mm
