proto protein in egg??

C

curioucity

Unbelievable and odd
Registered Senior Member
Hi

You know that from that so simple egg (take example: chicken egg) with only two or a bit more types of subsatnces, a tiny creature with all its organ functional is born (gaian, little chick has its feathers, beak, internal organs, talons etc). Now how can that be? Is it because of merely the DNA, or is it in fact the bio-matter contained within the egg has multiple types of protein etc?
thanks
 
Originally posted by curioucity
...a little chick has its feathers, beak, internal organs, talons etc)... Now how can that be? Is it because of merely the DNA, or is it in fact the bio-matter contained within the egg has multiple types of protein etc?
Click to expand...

Feathers, beaks, internal organs and talons are <B>ARE</B> protein. We are made protein.

Genes code for the production of these proteins. We ingest proteins and they are broken down to their constituent amino acids. These amino acids are distributed around the body and re-assembled in the cells into proteins that are required. The assembly of the proteins is coded for and controlled by genes. During development, prior to the stage when the organism can ingest food on it own, the amino acids for protein synthesis are provided by the mother. In placental mammals they are provided via the blood stream. In egg laying vertebrates, they are provided via the nutrient reserves in the egg or yolk sack.

Edit: I'm talking about essential amino acids that the cells of the organism are not able to synthezie themselves.
 
so there are indeed multiple types of amino acids contained in one egg, according to your explanation?
 
Any egg contains many
-proteins
-ribosomes and tRNA
-messenger RNA
-Morphogenetic factors
-protective chemicals

and bascially everything that an egg needs for the beginning of growth and development.

An egg will not transcribe any genes during the first phase of development and hence everything is needs to be present already from the beginning.
 
does that imply that an egg is in its dormant stage during the first few (say) days of its laying?
 
yes. An egg needs to be activated. That usually occurs with sperm entry.

transcription of genes usually doesn't happen immediately. It takes several cell division cycles before that starts. So in the beginning on transcripts or messenger RNAs that were already present are translated into proteins.

These messenger RNAa (mRNA) are usually protected before fertilization and need an active signal or modification before they can be used. That signal is initiated by once again fertilization.
 
Originally posted by curioucity
does that imply that an egg is in its dormant stage during the first few (say) days of its laying?
Click to expand...

in the case of chickens, the egg is dorment prior to it being fertilized by a male sprem, which occurs while the egg is still inside the female chicken. The egg still has no hard outer shell (which is how the sperm can enter and get to the female gamete part of the egg), and is much smaller than what we know as a "chicken egg". After the sperm enters, a chemical signal is triggered which first grows the egg is size (adding to both the yolk size and the cusion (the white) between the embryo and the soon to be formed shell). the egg is then laid - a few days after being fertilized and with the embryo already in the process of development.

If the fertilization never happens (ie, there are no male chickens around), then the chemical signal occurs on its own (it just takes longer for it to happen), and a non-fertile egg is produced. This does not happen in most animals, as it's not advantageous to be spending energy on eggs with no babys attached to them. That chickens do it would seem to be an effect of domestication (do wild turkey's chickens lay eggs regularly, even when not fertilized?) .

However, humans produce eggs on a regular schedule and then discard them if they are not put to use....Maybe it's in the food ;)
 
Originally posted by river-wind


However, humans produce eggs on a regular schedule and then discard them if they are not put to use....Maybe it's in the food ;)
Click to expand...

the human egg still needs activation by fertilization to become active.
 
Originally posted by spuriousmonkey
the human egg still needs activation by fertilization to become active.
Click to expand...
yeah - thanks, I wasn't specific. that's what I meant by "...not put to use.". :)
 
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