Egg come from chickens and chickens come from eggs: it's such an interesting question arise every human brain. The question was first proposed 2000 years ago by the Greek philosopher, Plutarch. The question and its answer was considered quite serious and important because it deals with whether the universe and life have a beginning. A chicken to lay an egg, but chicken come from egg, it's so chaotic question. This is not a special thing; Everything depends on a pre-existing something for it's existence. But the question is where did the first chicken came from? It came from an egg and where did that egg came from? It came from a chicken. This question is also puzzled, to understand these type of question we need to learn about evolution first.
EVOLUTION:
Evolution means the process of gradual changes that take place over many generations, during this process all species of animal and pant kingdom slowly changes their physical characteristics. In modern theory of evolution, Charles Darwin state that evolution happens by Natural Selection. He first formulated this theory on his book "on the origin of species" in the 1850s, on that book he described how organisms evolved over generation through inheritance of physical behavior traits.
He also proposed that species can change over time that new species form pre-existing, as natural selection result in adaption of a organism to is environment by means of selective reproducing changes in genetic constitution. In that process, time to time the genotype(There entire complex of genes inherited from both parents) changes.
MUTATION:
Mutation is a change of molecular level of DNA. It is a modification of genes, it may be affected on some physical or metabolic characteristics of organism.
Every cell in the body contain a set of chromosomes and genes, by long time cell division it originally constitutes in the egg cell at fertilization example human embryo developed by a human, all material carried in its chromosomes, in other word, chromosomes contain a large amount of DNA.
DNA build a long chains from four kind of simple chemical building blocks. In other word, way to explain these molecules provide a mechanism by which genes are duplicate themselves and reproduce the variations.
Around 312 million year ago the first amnion egg(That is a hard shelled egg) that could be laid on land, and the remains laid on water like the egg or fish and amphibians. Slowly, there was a mutation occurred in their genes after that they may change to a new organism.
At that same point of evolution history when there was no chicken, two birds that were almost same but not chicken those birds are called proto-chicken are mated and laid egg, that egg hatched into first chicken, Then we have to said that egg was came first. A few years ago, a group of scientists did write about how a particular protein required for chicken eggshell formation was only found in chicken ovaries. That data was often reported as evidence that the chicken was first, but even the scientists whose study it weren’t too convinced, with one of them calling the question “fun but pointless.”
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