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Cell division

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justridin (64.12.104.47)
Posted on Saturday, March 16, 2002 - 06:13 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Is there anyone here that could tell me how often does cell division take place in a zygote?
I've got untill the morning to have this answer.
Please e-mail me if it would'nt be too much of an inconvieniance for you.

Thanks
Lori.......Justridin@AOL.COM
 

Jos (142.177.80.185)
Posted on Saturday, March 16, 2002 - 09:06 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

The zygote is the fertilized oocyte, and undergoes multiple mitotic divisions in a process known as cleavage which result in blastomeres. Numbers and time frequency of division in some species is best described as "numerous" and "frequent". A frog egg for example can divide into 37,000 cells in 43 hours, and mitosis in cleavage stage Drosphilla occurs every 10 minutes for over 2 hours.

Here is a chart which shows information about that time period in the equine:

FertilizationVariesOccurs in the ampulla of the uterine tubules
ZygoteFertilized egg
BlastomereCells produced by the cleavage process
2-cell stage+/-24 hoursFirst division stage
4-6 cell stage+/-48 hours
8-10 cell stage+/-72 hours
MorulaDays 4-5
  • The youngest developmental stage that can be harvested for transfer
  • 6 day embryos are late morulas or early blastocysts
  • 32 to 64 cells
 

tyra reeves
Neonate
Username: Tired

Post Number: 1
Registered: 03-2006
Posted on Thursday, March 30, 2006 - 09:52 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Can anyone tell me what it means if a day 2 zygote has divided into 10 cells? This is quick-should only be 4 cells



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