That's a great question! It's tricky to give an exact number for the bases in a single human chromosome because:

* Chromosome size varies: Human chromosomes range in size, so the number of bases will differ between them.

* The human genome is complex: There are variations in the number of bases between individuals due to things like single nucleotide polymorphisms (SNPs).

However, we can give a general idea:

* Average range: A single human chromosome contains roughly 50 to 250 million bases. This is just an average, and the actual number can vary significantly.

* The entire human genome: The entire human genome, containing 23 pairs of chromosomes, has approximately 3 billion bases.

Let me know if you have any other questions!