Oh-Oh Genesis :) Flashcards
definiton of oogensis is
Meiosis , the specialized nuclear division that occurs in the ovaries to produce “the beginning of an egg”.
In the fetal period of the ___________ the diploid stem cells of the ovaries, multiply rapidly by mitosis
oogonia
before puberty all of the primordial follicles that are recruited undergo ____________
atresia (apoptosis, or programmed cell death)
In each cycle, one rescued follicle is “selected” to become the _________ __________and continues meisos I.
dominant follicle
what is the FIRST POLAR BODY
the dominant follicle’s production of two haploid cells. the two are quite dissimilar in size. the smaller one is the FIRST POLAR BODY
the larger cell of the dominant follicles two haploid cells contains all of the ___________ of the primary oocyte, and is called the ______ ____________
cytoplasm
secondary oocyte
T/F: the FIRST POLAR BODy may continue tis development and undergo meisos II, producing two even smaller polar bodies.
TRUE
if a sperm penetrates an ovulated secondary oocyte it completes meisos II, yielding one large _________ and a tiny _____ ______ _______
ovum
second polar body
what are the potential end products of oogensis:
three tiny polar bodies
one large ovum
what is the functional gamete?
the ovum
unequal cytoplasmic divisions that occur during oogensis ensure what?
that a fertizlied egg has ample nutrients for its 6-7 day journey to the uterus.
corpus luteum produces….
estrogen and progesterone
name the ovarian historoly from beginning to end
recruited follicle maturing follicle ovulation corpus luteum degenerate C. Luteum
define zygote
initial cell formed when two gamete cells are joined by means of sexual reporduction
what are the two phases that are involved in the maturation of a primordial follicle?
preantral and antral phases
what is the first phase of the maturation of a primordial folllicle?
preantral phase - intrafollicular paracrines such as cytokines and growht factors control oocyte and follicle developement
what is the second phase of the maturation of a primordial follicle
antral phase - directed by FSH and LH. Activated follicles grow tremendouls and the primary oocyte in the dominant follicle resumes meiosis I.
the female reproductive system produces _____ female gametes called ______
haploid
ova
the female repreductive system RECEIVES _____ male gametes called _______
haploid
spermatozoa
on the outer surface of an ovary there is a single layer of cuboidal epithelium or low columnar eipthlium. what is the name of this outer oayer of the ovary
germinal epitherlium
in a mature ovary there is a substantial layer of dense connective tissue found just below the surface layer of germinal epitherlium called?
tunica albuginea
what cells migrate from the wall of the yolk sac into indifferent gonad of the developing embryo during the 4th week of development
primordial germ cells
in what phase does the primary oocytes arrest in around the 5th month of fetal development
prophase of meiosis I
how long are the primary oocytes arrested in the prophase of meisos I
until ovulation
