"... the parent animal pre-exists, not only in idea, but actually in time. For man is generated from man; and thus it is the possession of certain characters by the parent that determines the development of like characters in the child." -- Aristotle, On the Parts of Animals, Book I, 350 B.C.
Ipse dixit.
MSNBC: Scientists Reportedly Crack Chicken or Egg Riddle.
It is an age-old riddle that has perplexed generations: Which came first, the chicken or the egg?
Now British scientists claim to have finally come up with the definitive answer: The chicken.
The scientific and philosophical mystery was purportedly unraveled by researchers at Sheffield and Warwick universities, according to the Daily Mail newspaper.
The scientists found that a protein found only in a chicken's ovaries is necessary for the formation of the egg, according to the paper Wednesday. The egg can therefore only exist if it has been created inside a chicken.
"No. What they found was a specific molecule called ovocleidin which is a member of a family of C-type lectin-like proteins. These things are all over the place; they're cell adhesion molecules, some are involved in cell signaling, some function in modulating the immune system and blood clotting pathways. They're even found in snake venoms. They're found in everything from C. elegans to mammals. Their key property is that they bind calcium.
ReplyDelete"In birds, these proteins have been coopted to regulate egg shell formation. They bind calcium and can seed the crystallization of calcium carbonate, and also control the rate of crystal formation. Chickens have ovocleidin, but geese have an ortholog, ansocalcin, and ostriches have struthiocleidin. There seems to be a lot of lability in what particular calcium-binding protein is used in shell formation, and it's probably the case that most of the sequence is free to mutate without affecting the nucleating function.
"You simply can't make the conclusion the reporter was making here. The species ancestral to Gallus gallus laid eggs, the last common ancestor of all birds laid eggs, the reptiles that preceded the birds laid eggs…the appearance of egg laying was not coincident with the evolution of ovocleidin. The first chicken that acquired the protein we call ovocleidin now by mutation of a prior protein also hatched from an egg." PZ Meyers, just a minute ago.
I couldn't have said it better myself...though I was trying when I happened upon his explanation.
Oils, if your understanding of science were the Blues, Eric Clapton would have been an accountant.
The first chicken actually came from a peanut butter jar.
ReplyDeleteThe first chicken was a crossbreed between a peanut butter jar and a bananna.
ReplyDeleteJeffery, I do believe we can agree!
ReplyDelete