End result of spermatogenesis

End result of oogenesis

Fertilization

Cleavage

Blastula

Gastrulation

Gastrula

ectoderm

endoderm

mesoderm

Animal pole vs vegetal pole

Cell movements during gastrulation

Molecular basis of gastrulation

fate maps

Roux's experiment

Driesch's experiment

totipotency

Horstadius' tier experiments

John Gurdon's experiments

Regulative Development Model

Asymmetric Division

Symmetric Division

How do cells know which genes to express?

How animal-vegetal axis is determined (in Xenopus)

How dorsal ventral axis is determined (in Xenopus)

Induction

Spemann's separation experiment

The Organizer

dorsal lip of the blastopore

Results of dorsal lip transplant

B-catenin

Specification

Determination

Involuting Marginal Zone cells

Neurula

What's in a human sperm cell?

What's in a human egg cell?

Egg-sperm recognition

Fast block to polyspermy

Slow block to polyspermy

Follicle Stimulating Hormone (FSH)

Corpus luteum

Luteinizing hormone

where does fertilization (as well as the first cleavage) occur?

first ball of cells after cleavage in humans

human chorionic gonadotrophin (hCG)

Implantation

chorionic gonadotropin

The Four Extra-embryonic Membranes

Chorion

Amnion

Yolk sac

Allantois

First Trimester

Second Trimester

Third trimester