Help: Beginning of Human Life

Human Anatomy, Physiology, and Medicine. Anything human!

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scytale
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Help: Beginning of Human Life

Post by scytale » Thu Sep 06, 2007 4:07 pm

What provides the original zygote the instructions to develop into a human? Is it just the DNA or is there something else involved?

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kotoreru
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Post by kotoreru » Thu Sep 06, 2007 4:19 pm

Ooooh no....what a question. DNA is what makes us what species we are.
"What are humans if they don't learn at University? Animals, yes."

^^One of my ex-girlfriends said that. I stress the ex part.

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MrMistery
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Post by MrMistery » Thu Sep 06, 2007 6:21 pm

not really. Wikipedia or google "cytoplasmic determinants"
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Post by scytale » Fri Sep 07, 2007 2:18 pm

I'm having trouble finding anything good on cytoplasmic determinants. Could you either give me a good website or give me some sort of explanation?

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Post by MrMistery » Fri Sep 07, 2007 7:45 pm

"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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Post by scytale » Sun Sep 09, 2007 9:54 am

thanks for the links.

what in its makeup differentiates a totipotent cell from a non-totipotent cell?

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Post by MrMistery » Sun Sep 09, 2007 6:21 pm

Good question. No simple answer really. A cell that has lost its totipotence has begun the process of determination. It has to do with gene expression. This is a delicate subject because some cells can regain their totipotence...
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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mith
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Post by mith » Sun Sep 09, 2007 8:19 pm

A nobel prize question
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

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Post by MrMistery » Mon Sep 10, 2007 5:21 am

Not quite. I think that we do know how this occurs. It's just that the answer takes a 5-volume book
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Post by scytale » Mon Sep 10, 2007 11:07 am

how would cells regain their totipotency?

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Post by MrMistery » Mon Sep 10, 2007 12:18 pm

i told you, there is no simple answer to this. pick up a book on genetics and development and start reading. After many many hours of reading you will probably understand it.
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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