Question

the condition of having a single copy of a given chromosome diploid trisomy haploid monosomy

Explanation:

Monosomy is the condition where an individual has only one copy of a particular chromosome instead of the normal two. Diploid refers to having two sets of chromosomes. Trisomy is having three copies of a chromosome. Haploid is having a single - set of unpaired chromosomes but doesn't specifically refer to the condition of having one copy of a particular chromosome within a normally diploid cell.

Answer:

D. monosomy