Cleavage

• what are the ootypes:

  • isolecithal
  • mesolecithal
  • telolecithal
  • centrolecithal
• isolecithal → equal (uniform)
• mesolecithal → middel (moderate yolk amount)
• telolecithal → end
• centrolecithal → centre
• main patterns of cleavage → holoblastic and meroblastic
• holoblastic → complete cleavage
• meroblastic → incomplete cleavage
• isolecithal - radial

  
• isolecithal - spiral

  
• isolecithal - bilateral

  
• isolecithal - rotational

  
• Mesolecithal - radial

  
• telobalastic - bilateral

  
• 
  

  telolecithal - discoidal

  
• Centrolecithal - superficial

  
• ootypes of holoblastic cleavage → isolecithal and mesolecithal
• ootypes of meroblastic cleavage → telolecithal and centrolecithal
• isolecithal patterns → radial, spiral, bilateral and rotational
• mesolecithal patterns → radial
• telolecithal patterns → bilateral and discoidal
• centrolecithal patterns → superficial
• animal pole → least amount of yolk
• vegetal pole → most amount of yolk