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.
One of them is known as sex chromosomes. Other 22 are autosomes. Sex chromosomes are of 2 types; X and Y. Y is smaller, and X and Y are partially homologous. However, they pair and segregate into daughter cells during meiosis. Males have X and Y combinations. Females have X and X combination.