Chapter 28: Reproductive System Flashcards
gametogenesis
forming sex cells
sex cells =
gametes
female gametes
secondary oocyte
male gametes
spermatozoan
mitosis
- somatic cell division
- diploid daughter cells
- no crossing over
mitosis produces
Two daughter cells genetically identical to the parent cell
meiosis
- sex cell division
- haploid daughter cells
- includes crossing over
meiosis produces
Four daughter cells are genetically different from the parent cell
oogenesis
maturation of a primary oocyte to secondary oocyte
- occurs in stages over the life of a female childhood
ovaries inactive with no
follicles developing
atresia
regression of primordial follicles (from original 1.5 million)
by puberty, only ____________ follicles remain in ovaries
400,000
mature eggs are called
secondary oocyte
release of a secondary oocyte from the ovary is called
ovulation
meiosis not completed until
fertilization
fusion of male gamete and female gamete produces a cell with the correct number of chromosomes
diploid; 46
menopause
- women cease reproductive cycle for 1 year
- usually around ages 45 to 55
- follicle maturation stops
perimenopause
the preliminary time of irregular cycles leading to menopause
during menopause ____________ and ___________ no longer secreted
progesterone and estrogen
average days of the reproductive cycle of females
28 days