1. Spermatozoan structure
Nuclear DNA and digestive enzymes to breakdown the outer layers of ovum
Neck with mitochondrial DNA
Locomotion
Head
Nucleus
Midpiece
Tail

2. Egg & Fertilization Egg plasma membrane Outer protective layers
Zona pellucida in mammals
Contains receptors for sperm binding
Vitelline layer in non-mammals w/outer jelly layer w/receptors
Egg plasma membrane
w/cortical granules
Zona pellucida

3. Fertilization

4. Unfertilized; 00:00
Fertilized; 00:02
First Division; 01:30
Second Division; 04:00
Third Division; 16:00
Blastula; 20:00

5. Cleavage: early cell division
Zygote divisions or cleavage
cells called blastomeres
Reduction of cell size; increases SA/V ratio
Radial cleavage
Alligned (lat./long.) splits
Deuterostomes
Spiral cleavage
Divides at 90o offset
protostomes

6. Morula
blastomeres

7. Blastula

8. Gastrula
mesoderm
blastopore

9. Coelom Development