Friday, October 26, 2007

What Comes First? Plus Nostalgia.

Ever wonder which came first, the chicken or the egg? (: let's solve this once and for all.

This question appears regularly in the question file, so let's take a shot at it. In nature, living things evolve through changes in their DNA. In an animal like a chicken, DNA from a male sperm cell and a female ovum meet and combine to form a zygote -- the first cell of a new baby chicken. This first cell divides innumerable times to form all of the cells of the complete animal. In any animal, every cell contains exactly the same DNA, and that DNA comes from the zygote. Chickens evolved from non-chickens through small changes caused by the mixing of male and female DNA or by mutations to the DNA that produced the zygote. These changes and mutations only have an effect at the point where a new zygote is created. That is, two non-chickens mated and the DNA in their new zygote contained the mutation(s) that produced the first true chicken. That one zygote cell divided to produce the first true chicken. Prior to that first true chicken zygote, there were only non-chickens. The zygote cell is the only place where DNA mutations could produce a new animal, and the zygote cell is housed in the chicken's egg.

So, the egg must have come first.


come to think of it, this is the last day of school. and the sec 2 are being separated. the feeling is coming to me again. i remember of how 2a`o6 used to be. time passed so fast, it's been a year. i remembered the last day ended with the street dance competition and 2a got second. it was a memorable day and the class separated feeling happy for the street dance people that day. but the competition didnt mark the last of 2a. it was the chalet, we had so much fun, water bombing all these. seemed as though water bomb was our 2a hobby, like most of the time, we water-bombed. and i still remembered we had bbq at pasir park during sec 1 and some of us were scolded for wetting a shop area. :/ the sad and happy we went through, it was really great. even if there were bad things that happened to us, at least we were being scolded as one. and ms rani, remember? many funny things happened then and i recalled ah gong write a letter about 'talking at the bottom of his lungs'? jokes made in class were super funny, and probably because we are all chinese (not being racist) and we bonded even closer. and and and CFN! 210706. <33>you heard me say i was leaving.
maybe i should.

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