An аlien biоlоgist оn а collection trip, using the lаtest alien technology, randomly "collects" a few cells from a few unknowing humans. After analysis back in the home galaxy, the biologist finds all cells collected were indeed human. But to the alien's surprise, while all the others contained 46 chromosomes, one cell contained only 23. Investigation showed that all equipment and techniques were flawless. Indicate the statement that is the most likely explanation.