Define monosomy.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Monosomy**: Monosomy is a genetic condition characterized by the presence of only one copy of a particular chromosome in a diploid organism, instead of the usual two copies.

2. **Chromosomal Count**: In a normal diploid organism, there are typically 46 chromosomes (23 pairs). However, in the case of monosomy, there is a reduction in the total number of chromosomes to 45 due to the absence of one chromosome.

3. **Etymology**: The term "monosomy" is derived from the Greek words "mono," meaning one, and "soma," meaning body or chromosome. Thus, it literally means "one chromosome."

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