A spontaneously aborted human embryo is characterized with respect to karyotype, and it is found to be normal except that it contains only one chromosome number two. This is an example of what type of aneuploidy?

monosomy or loss of a single chromosome

Explanation:

The presence of a given number of chromosomes in a cell that differs from the normal number of chromosomes defined for an organism is termed as aneuploidy. There can be either an extra chromosome present or a chromosome that can be missing thus leading to either an increase or decrease in the number of total chromosomes in the organism. If there is a loss of a single chromosome in the cell then this type of aneuploidy is termed as monosomy. In a normal individual if two copies of one chromosome are present then monosomy would result only in the presence of a single chromosome. This type of condition can lead to different genetic defect and disorders, one such example is turner syndrome. Therefore, in the spontaneously aborted embryo, the presence of only one chromosome number two is a type of monosomy.