Question

score: 479/600
if a nondisjunction occurs during meiosis i:
two of the four resulting cells will be aneuploid.
one of the four resulting cells will be aneuploid.
none of the four resulting cells will be aneuploid.
three of the four resulting cells will be aneuploid.
all four resulting cells will be aneuploid.

Explanation:

Meiosis I involves the separation of homologous chromosomes. If nondisjunction occurs here, both homologous chromosomes move to one pole instead of separating. This produces two daughter cells: one with an extra chromosome set and one missing a set. Each of these then undergoes meiosis II (sister chromatids separate normally), resulting in four cells—two with an extra chromosome and two missing a chromosome. Thus, all four cells are aneuploid.

Answer:

all four resulting cells will be aneuploid.