Question

In meiosis, if all of the chromosomes fail to separate normally, and end up migrating to one of the two daughter cells, the result is that all four cells are abnormal. This event is known as _______________________.

a) Nondisjunction.

b) Translocation.

c) Crossing-over.

d) Segregation.

Answer 1

Nondisjunction is the failure of chromosomes to separate normally during meiosis, resulting in aneuploid gametes with an abnormal number of chromosomes. If all chromosomes fail to separate and migrate to one daughter cell, all resulting cells will be abnormal.

Step-by-step explanation:

Nondisjunction is the failure of homologous chromosomes to separate during meiosis I or the failure of sister chromatids to separate during meiosis II. This results in aneuploid gametes, which have an abnormal number of chromosomes. In the case where all chromosomes fail to separate and migrate to one daughter cell, all four resulting cells will be abnormal due to the abnormal chromosome numbers.