Step 1: Understanding the chromosomes.
In humans, there are a total of 46 chromosomes in each cell, consisting of 22 pairs of autosomes (non-sex chromosomes) and 1 pair of sex chromosomes.
Step 2: The sex chromosomes.
The sex chromosomes are responsible for determining the biological sex of an individual. In males, the sex chromosomes are XY, and in females, they are XX.
Step 3: Conclusion.
Therefore, the number of sex chromosomes in every human cell is 1 pair.
Final Answer: 1 pair.