Development Flashcards
What is it called when an egg and sperm mix together?
A zygote
What is the outer matrix of the egg called?
Zona pellucida
What are the four different stages of development?
Pre-embryonic development
Embryonic development
Fetal development
Development after birth
What are the three germ layers and what do they turn into?
Ectoderm (nervous system)
Mesoderm (skeletal, muscular, Urinary, reproductive systems)
Endoderm (digestive and respiratory system)
What’s the first visible system in embryos?
The nervous system
What is the tip of the sperm called and what does it do?
It’s called the acrosome and it secrets enzymes to digest part of the zona pellucida of the egg
Which gene decides gender?
If the SRY gene is present by week 6 the embryo will develop into a male
