What is oogenesis
Ovum production which begins before birth, accelerates at puberty and ends at menopause
What is fertilization
Conception. The fusion of two haploid gametes containing 23 chromosomes each ( fusion of male and female pronuclei )
What does fertilization produce?
A zygote containing 46 chromosomes
How many sperm reach isthmus
200
What is releaSed from the acrosomal cap
hyalouronidase
Where does 1 sperm push through
Corona radiata
Sperm and oocyte membranes fuse and trigger what?
Activation of oocyte, completing meiosis II
Formation of the pronucleus begins and
- 2nd polar body is formed
- Metabolic enzymes activated
- mRNA activation for protein synthesis
- Sperm is absorbed into cytoplasm
- Female pronucleus develops
Spindle formation and cleavage prep
- Male pronucleus migrate to the cell
- Spindle fibers form
- Mark preparation for first cleavage division
Fusion of pronuclei =
Amphimixis
Amphimixis =
Conception
When does the first cleavage division begin
After conception
First cleavage division results in
- Yields two daughter cells
2. Called blasteomeres
The sequence of forming a blastocyst
- First cleavage division
- 2 cell stage
- 4 cell stage
- Morula
- Advanced morula
- Hatching to a blastocyst
What happens to the blastocyst
After 6-7 days it attaches itself to the endometrium of the uterus
What does the blastocyst consist of?
- Trophoblast which is the outer layer of cell providing nutrients to embryo
- Blastocoele
- Inner cell mass that forms embryo
Which side is the inner cell mass side facing
The uterine wall
