Path of Development
1.
Spawn Urchins
2.
Observe Sperm MotilityUse a fairly high concentration of sperm to maximize viewing.
3.
Sperm Events
Animations:
4.
Just The Right Amount Of SpermIf too many sperm then you get Polyspermic Development. Use a low concentration of sperm to fertilize eggs.
Animations:
5.
When Sperm Meets EggUpon activation the cortical granules fuse with the plasma membrane of the egg.
Animation:
6.
To Cell DivisionMitosis involves the division of the centrosome and chromosomes.
Animation:
Videos:
- Nuclear Migration – shows the nucleus centering
- 1-4 – shows the first two divisions
- Zygota – Sea Studios video of first division
7.
Later Development
Animations:
- Urchin
- 3D to Prism
- Gastrulation
- Pluteus to juvenile
