Final answer:
The single regulatory region for the globin gene family is located in the intergenic region on the chromosome, and is crucial for controlling gene expression of hemoglobin chains.
Step-by-step explanation:
In the human globin gene family, the single regulatory region for each globin gene is located in the intergenic region on the chromosome. This region is responsible for controlling the expression of the globin genes, which include the alpha, beta, gamma, and delta chains of hemoglobin. A well-known example of a mutation in this region is seen in sickle cell anemia, where a single nucleotide change in the beta-globin gene leads to the production of abnormal hemoglobin. Similarly, mutations in the promoter region of the globin genes can lead to conditions such as beta-thalassemia, which results in reduced levels of hemoglobin and anemia.