Question

First-division nondisjunction will only yield gametes with an extra chromosome. True or False

Answer 1

Answer: False  

Explanation:

Non disjunction of the chromosomes can be defined as the condition in which homologous chromosome fails or the sister chromatids fails to separate properly during the time of cell division.

In case of the first division non disjunction will yield a cell with an extra chromosome besides normal and another cell with no chromosomes in it. Incase of the normal condition a parent cell divides into two daughter cells with one chromosome each.

This can be caused due to the failure of the homologous chromosomes to get separated during meiosis I. It results in the aneuploidy.