In chapter 3, Dawkins describes how all things are different and unique. Although this is true, it is also true thats all things are made by one molecule... DNA. This chemical chain is the basis of our life. Without this life chain we would not be able to live, and we would all be exactly the same. This theory led Dawkins to believe that everything came from some sort of replicator that was somehow able to preserve its patterns and some of its genes. This is how we all came to be. The future generations from the replicators makes us similar and the slight mutations and changes in the patterns and genes causes our unique DNA.
How a gene helps its host and how in return the host will help provide for its genes. This double sided effect is essential for the survival of both the host and the gene. While they make a great team and work off each other, they may also be the worst of enemies and work against each other. if a gene has the wrong chromosomes and genetic makeup for the host, and it is causing a disadvantage for the survival of the host, then the host will leave it and it will die off on its own without help and nutrients. this does not only hurt the gene, it also makes it harder for the host to find genes to carry.
When the host dies, the gene pool dies with it. In humans, the gene pool begins to fade when you are younger and it is already empty by the time you hit that end of the road. The genes die off and leave the body in all ways possible. This cleanses your body and decreases the amount of genes and DNA in your body so by the time you die, your genes will have dissolved and disappeared. This is Dawkins way of describing how all things work and why they are the way they are.
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