Body: The Rhesus factor — discovered in 1937 — is a second la…

Question

Did you know? The Rhesus factor — discovered in 1937 — is a second layer on top of A/B/O. "Positive" or "negative" refers to the presence of the Rh antigen. 85% of Europeans are Rh+; 99% in some Asian populations. The combination gives 8 main blood types total — e.g. O-negative is "universal donor".

Accepted Answer

The Rhesus factor — discovered in 1937 — is a second layer on top of A/B/O. "Positive" or "negative" refers to the presence of the Rh antigen. 85% of Europeans are Rh+; 99% in some Asian populations. The combination gives 8 main blood types total — e.g. O-negative is "universal donor".

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