Tiger's Embryonic Development

The Embryonic Development

It starts after fertilization.

It also consists of three stages...

1. Cleavage
• The Zygote, one large cell, divides itself into multiple smaller cells called blastomeres.
• Cleavage patterns differ between different groups of animals depending on their evolutionary relationship.
• The cleavage goes through vegetal pole but the resulting blastomeres are larger in the vegetal pole than in animal pole.
• The Blastocoel develops in the animal pole
2. Gastrulation
• After the first few cell divisions (cleavage), there is a rearrangement of cells to form a three layered embryo.
•  Ectoderm-the cells that remain on the outside of the gastrula
• Mesoderm-the cells that detach and move into the blastocoel
• Endoderm-the cells that invaginate from the vegetal plate to become the primitive gut
  
  
3. Organogenesis
• Different regions of the three embryonic germ layers develop into the rudiments of organs.