User talk:98.216.10.175

This article states that George Streisenger was the first person to clone a vertebrate. I don't think this is correct. The provided link goes to a memorial page that is now dead, not to a scientific paper. And an archived copy of the memorial page does not say he cloned zebrafish. It say he developed a method for parthenogenesis. Parthenogenesis in some species involves an egg that does not undergo meiosis (i.e. it stays diploid) and is then triggered to develop. Such embryos will be genetically identical to their parents, although this is not typically thought of as cloning. Importantly the parthenogenesis that George developed is different. In his case, the zebrafish eggs undergo meiosis to form a haploid genome and then he blocks the first cell division to restore the embryo to diploid. This is a remarkable achievement, but importantly it does not result in genetically identical offspring because the reductive division of meiosis has already occurred--i.e. basically a "random" a copy of each gene is thrown out to make a haploid cell and then a copy of each gene is made to create a diploid. Just as all sperm and eggs are different from each other, all such pathogenetic embryos are different from each other and their mother.