SEXUAL REPRODUCTION (SPERM EGG) Flashcards
(18 cards)
- The production of sperm and In male animals, it occurs in the testes
Spermatogenesis
Primary spermatocytes undergo meiosis I, forming two haploid cells called
secondary spermatocytes
Secondary spermatocytes undergo meiosis II and their daughter cells are called
are small round cells seen close to the lumen of the tubule
spermatids
Late in spermatogenesis, spermatids are nonmotile
true
spermatids lose excess cytoplasm and form a tail, becoming motile sperm
Spermiogenesis
The production of egg cells
In female animals, it occurs in the ovaries
Oogenesis
Early in development, diploid oogonia produce
diploid primary oocytes
In humans, for example, about 1 million primary oocytes per ovary are produced before birth
true
Physical Signs of Ovulation
Cervical mucus changes
Mild pelvic or abdominal pain
Increased libido
Breast tenderness
Slight rise in basal body temperature (BBT)
Changes in cervix position
Mild pelvic or abdominal pain
Mittelschmerz
How many candidate egg cell for female
1
Stage of Meiosis in egg cells at Birth
Primary oocyte diplotene of Prophase I
Stage of Meiosis in egg cells At puberty every month
Secondary oocyte progress to metaphase II, release from the ovary
Stage of Meiosis in egg cells At Penetration of the sperm
continue to anaphase II
Production of female sex cells by meiosis
Oogenesis
appear as oogonia are transformed into primary oocytes
Primary oocytes begin meiosis but stall in prophase I
Primordial follicles
a type of somatic cell around which spermatids develop in the tubules of the testis.
sertoli cells
Variation arises in each generation due to
Independent assortment of chromosomes
Crossing Over
