Which came first, Chicken or Egg???

Hey guys,
we have been very close with a question since childhood ,
      and we were all anxious to find out the answer of the question "Which came first , Chicken or Egg? 

Which came first, the chicken or the egg? The chicken, no, the egg, no, the chicken, no, the egg. It's enough to make your head spin right off your neck.

     Basically, many, many moons ago there was a chicken-like bird. It was genetically close to a chicken but wasn't a full-blown chicken yet. we can call it proto-hen.
      So proto-hen laid an egg, and proto-rooster fertilized it. But when the genes from ma and pa almost-chicken fused, they combined in a new way, creating a mutation that accidentally made the baby different from its parents. Although it would take millennia for the difference to be noticed, that egg was different enough to become the official progenitor of a new species, now known as the chicken! So in a nutshell or an eggshell, two birds that weren't really chickens created a chicken egg.

If we need a simple description then here it is-:

Because Ovocleidin-17 protein  is expressed by the hen and not the egg , the bird in which the protein first arose, though having hatched from a non-reinforced egg, would then have laid the first egg having such a reinforced shell: the chicken would have preceded this first 'modern' chicken egg.

          and hence, we have an answer: The egg came first, and then it hatched a chicken.