GENE CENTRALITY. “The egg contains the hen’s genes, which combine with the rooster’s genes. The genes create from the raw materials of organic life another chicken. That chicken then has another egg. It is not the egg, but the genetic material that the egg nourishes and brings to fruition that is important. It is the genes that must be passed on if a species is not to become extinct.”
http://public.wsu.edu/~taflinge/biosex1.html