Fertilization

Question 1

In Star Trek, why can’t a Klingon and a Vulcan mate? (Assuming they are different species)

Answer 1

Sperm must recognize species specific molecule in Zona pellucida

Question 2

What happens when capacitated sperm binds to Zona pellucida?

Answer 2

Fast increase of intracellular Ca

Question 3

What happens when there is an increase of sperm intracellular Ca?

Answer 3

Digestive enzymes (hyaluronidase) allow sperm to traverse to egg surface

Question 4

What happens when the sperm & egg membranes fuse?

Answer 4

Ends acrosome reaction, begins fertilization:
- Large increase in Ca in cytoplasm of eggs
- Causes discharge of cortical granules

Question 5

list 2 functions of cortical granules

Answer 5

1. activates dormant oocyte, completes Meiosis II
2. Zona pellucida modification blocks other sperm from binding to egg

Question 6

What is formed when nuclei unite?

Answer 6

Zygotic embryo

Question 7

where does fertilization occur?

Answer 7

oviduct (fallopian tube)

Question 8

Where does transport of zygote occur? How?

Answer 8

Oviduct by cilia to the uterus for implantation