If nondisjunction occurs in meiosis II during gametogenesis, what will be the result at the completion of meiosis?
A) All the gametes will be diploid.
B) Half of the gametes will be n + 1, and half will be n - 1.
C) 1/4 of the gametes will be n + 1, 1/4 will be n - 1, and 1/2 will be n.
D) There will be three extra gametes.
E) Two of the four gametes will be haploid, and two will be diploid.

Question

Quizplus · Accepted Answer

Nondisjunction in meiosis II results in two daughter cells receiving both sister chromatids of a chromosome, while the other two receive none. If this occurs during gametogenesis, half of the resulting gametes will have an extra chromosome (n + 1), while the other half will be missing a chromosome (n - 1). This is because during meiosis II, the two daughter cells containing both sister chromatids of a chromosome will eventually separate so that each daughter cell only receives one chromatid, resulting in a gamete that has too many or too few chromosomes. The remaining two daughter cells, which each received one chromatid during meiosis II, will separate during meiosis and produce normal haploid gametes.

If Nondisjunction Occurs in Meiosis II During Gametogenesis, What Will