Which of these could lead to the mistake evident in the karyotype?
A)a failure of cytokinesis after meiosis I in gamete formation
B)a nondisjunction in meiosis II in gamete formation
C)crossing over in meiosis I in gamete formation
D)fertilization by two sperm in zygote formation

Question

Quizplus · Accepted Answer

Nondisjunction in meiosis II in gamete formation can lead to the mistake evident in the karyotype. This would result in one gamete receiving an extra chromosome and the other gamete receiving one less chromosome, which is known as aneuploidy. When these gametes fuse during fertilization, the resulting zygote will have an abnormal number of chromosomes.

Which of These Could Lead to the Mistake Evident in the Karyotype