Britannica Sources used in this answer

Where is blood type B especially prevalent?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Close-up illustration of multiple human red blood cells with their characteristic disc shape, floating against a red background. — blood group The major component of human blood is the red blood cell.

The maximum frequency of the B gene, which determines the presence of the B antigen in the ABO blood group system, occurs in Central Asia and northern India. While blood group frequencies vary across global populations due to factors such as genetic drift and natural selection, type B is notably prevalent throughout Asia, with its highest concentration specifically identified in the northern regions of India.12