Human life Cycle Flashcards
Sperm cell penetrates egg cell to reproduce
Fertilization
Fertilized egg, fusion of sperm and egg
Zygote
Factors for successful sperm penetration and fertilization
- Ability of motility
- All structures are fully funtional
- Environment should be welcoming
Formation of gametes
Gametogenesisn
Male gametogenesis
Spermatogenesis
Spermatogenesis location
Testes
Female gametogenesis
Oogenesis
Oogenesis location
Ovaries
Spermatogenesis process
- Diploid to primary spermatocytes
- Chromosomes duplicated, homologous chromosomes pair up
- Meiosis I to produce 2 secondary oocytes
- Meiosis II to produce 4 spermatids
- Spermatids mature tonsperm cells
Oogenesis process
- Diploid to primary oocytes
- Chromosomes duplicated, homologous chromosomes pair up
- Meiosis I to produce secondary oocyte and first polar body
- Meiosis II triggered by sperm
- 1 ovum and 3 ootids
- Ootids mature into polar bodies
Overview of early embryonic stage
- Gamete formation
- fertilization
- Cleavage
- Gastrulation
- Organ Formation
- Growth Specialization
Gamete formation
Eggs and sperm forms
Fertilization occurs in
Fallopian tube
Division of zygote cells into 2-4-6-8….
Cleavage
Zygote continues to divide until
Blastocyst is reached
Where do blastocyst implant
Uterine wall
Formation of germ layers
Gastrulation
Embryonic stage that develops from the
morul
Blastocyste
Stage of the zygote at 32 cells
Morula
Surface Epithelium,
outer sphere of cells.
Trophoblast
Cavity soace inside a blastocyst
Blastocoel
Small clump of cell inside blastocyste where embryo develops
Inner cell mass
Protects the embryo
Zona pellucida
Refers to the attachment of the
blastocyst to the uterine lining
Implantation
