Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: Human Genome, Chromosomes, and Genes. Each chromosome of the human genome contains many genes as well as noncoding intergenic (between genes) regions. Each pair of chromosomes is shown here in a different color. Notice that there are 23 pairs of chromosomes. Answer: 23 pairs
A:
How many pairs of chromosomes do human have ?