Flashcards in Fertilization-The First Week Deck (23)
how many sperm will fertilize the secondary oocyte
the two layers that the sperm must go through are ?
corona radiata and the zona pellucida
what produces the zona pellucida
oocyte and the follicular cells which makes the primordial germ cell become a primary follicle
prevents any further fertilization by the sperm
after the sperm fertilizes the egg what happens to the oocyte
finishes off the 2nd meiotic division!
What are the 3 main things fertilization results in ?
restoration of a diploid genome, determines the genetic sex of the embryo, intitiation of cleavage
what determines the sex of the embryo ?
whether or not the sperm is carrying an X or an Y chromosome
consists of estrogens and progesterone
levonorgestrel (progesterone analog)
acts as an antiprogesterone
what happens within 24 hours of fertilization
cleavage which is a series of regulated mitotic cell divisions and there is NO growth in size at this time
What is compaction in reference to the morula?
cells increase surface contact with other cells, increase gap juctions to allow communication and it starts to show polarity and shift the nucleus and cytoplasm
morula begins to form a fluid filled space and is called what now
pregnancy anywhere outside of the uterus
implantation in the lower part of the uterus (generally near the cervix)
tearing or disconnected placenta
abnormal growth of the placenta and if it invades or grows into the musculature
when the oocyte releases all of its lysosomal contents in reaction to the penetration by the sperm
the maternal pronucleus is important in what
development of embryo
the paternal pronucleus is important in what
implantation occurs how many days after fertilization