cleavage

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Author:
nganle
ID:
204187
Filename:
cleavage
Updated:
2013-03-02 19:08:24
Tags:
cleavage
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Description:
cell dev
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  1. zygote divides into blastomeres in ?
    exponential progression
  2. end of cleavage ?
    blastula
  3. end of gastrulation ?
    germ layer form gastrula
  4. isolecithal egg ?
    • holoblastic cleavage 
    • blastocoel 
    • sea urchin
  5. mesolecithal egg ?
    • holoblastic cleavage 
    • blastocoel
  6. telolecithal egg ?
    • discoidal cleavage 
    • blastocoel 
    • bird
  7. centrolecithal egg ?
    • superficial cleavage
    • insect
  8. holoblastic cleavage ?
    entire egg is cleaved during cytokinesis
  9. meroblastic cleavage  and type ?
    • partial cytokinesis
    • 2 type : discoidal and superficial cleavage
  10. what is meridional cleavage in cytokinesis of sea urchin ?
    cleavage furrow pass through animal and vegetal poles
  11. what is equatorial cleavage of sea urchin egg ?
    perpendicular to animal and vegetal pole
  12. equal cytokenesis at animal cells ?
    daughter cells of equal size
  13. unequal cytokenesis at vegetal pole?
    daughter cells of unequal size
  14. fluid filled region called ?
    blastocoel
  15. cleavage pattern of sea urchin egg is ?
    radial cleavage ?
  16. what is the same between sea urchin and animals cleavage ?
    holoblastic and radially symmectric
  17. what shape of third cleavage in amphibian ?
    mulberry
  18. morula in amphibian ?
    cytokinesis in blastomere is unequal
  19. at 128 cells stage what appear in amphibians
    blastocoel cavity appear
  20. what forms when outermost cells become polarized ?
    • tight junction cells joint together 
    • gap junction communicate channels
    • desmosomes form epithelium
  21. mammals at 8 cells stage, embryo undergoes ?
    compaction
  22. compaction ?
    • blastomeres stick together to form solid ball of cells
    • each blastomere undergoes polarization
  23. polarization ?
    • tight junction is formed beneath external surface to stop material enter embryo
    • gap juntion is formed between internal surfaces to communicate with cytoplasm another
  24. process formation of fluid filled cavities inside embryo called ?
    cavitation
  25. what interact with wall of uterus ?
    trophoblast
  26. what cells form embryo proper ?
    inner cell mass ICM

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