If nondisjunction occurs during meiosis I,
A)the resulting sex cells are heterogametes.
B)one-half of the resulting cells are n + 1, and the other half are n - 1.
C)diploid cells are produced.
D)all gametes will lack a chromosome and be infertile.
E)only one half the gametes are affected.

Question

Quizplus · Accepted Answer

Nondisjunction during meiosis I results in a division where one cell receives both homologous chromosomes and the other cell receives none. This results in half of the cells having an extra chromosome (n + 1) and the other half missing a chromosome (n - 1). This is known as aneuploidy, which can lead to genetic disorders such as Down syndrome.

If Nondisjunction Occurs During Meiosis I