What would happen if one of the chromosomes failed to split at the end of metaphase

Aneuploidy

Explanation:

Aneuploidy: It is the condition when one of the chromosome failed to split at the end of metaphase due to nondisjunction. So aneuploidy will produce monsomial and trisomial cells.

Monosomy; Diploid genome that lacks a single chromosome.

Example; Turner syndrome.

Trisomy; Diploid genome that have one extra chromosome.

Example; Down syndrome.