There are 10 passport offices in the city of Phoenix where citizens of the United States can apply for a new passport. The majority of facilities are located at local post offices. An acceptance agent at these locations will receive your application form and supporting documents, administer an oath and witness the signing of the form.
backcross. in experimental genetics, union between a heterozygote of the first generation and one of its parents or an organism genetically identical to one of its parents. double backcross the mating between a double heterozygote and a homozygote.n experimental genetics, union between a heterozygote of the first generation and one of its parents or an organism genetically identical to one of its parents. double backcross the mating between a double heterozygote and a homozygote.
up vote 16 down vote. The double cross is known as a Patriarchal cross and is well described in the Wikipedia article. There's no point in reproducing more than a sample here: The Patriarchal cross is a variant of the Christian cross, the religious symbol of Christianity. Similar to the familiar Latin cross, the Patriarchal cross possesses a smaller crossbar placed above the main one, so that both crossbars are near the top.