A NATO official, speaking on condition of anonymity, pointed out that after the attacks NATO sent AWACS planes to patrol American skies and deployed a third of the troops in Afghanistan for more than a decade; more than 1,000 soldiers from non-U.S. NATO allies and partners were killed there, the official pointed out.
Cells in the human body have 46 chromosomes, including 22 pairs of autosomes and one pair of sex chromosomes (XX in females, XY in males). Because there are two sets of chromosomes, one from each parent, the cells are considered diploid.
These 23 pairs of chromosomes are known as nuclear DNA because, with the exception of red blood cells, they reside in the nucleus of every cell in our body. The 23rd chromosome is known as the sex chromosome. As with the other chromosomes, one is inherited from the father, and one from the mother. The 23rd chromosome from the mother is always an X. From the father, a person either inherits an X chromosome or a Y chromosome. The chromosome inherited from the father determines their gender. An X from the father would result in an XX combination, which is a female. A Y from the father would result in an XY combination, which is a male. We also inherit our mitochondrial DNA, mtDNA, from our mother, and none from our father.