During meiosis [my-OH-sis], when a cell has lost both members of a homologous [huh-MOL-uh-guhs] pair of chromosomes, which of the following types of aneuploidy [an-yoo-PLOI-deep] would apply to the cell?

W) Tetrasomy

X) Nullisomy

Y) Monosomy

Z) Trisomy
X) NULLISOMY