Rh gene

Rh gene

Any of eight allelic genes that are responsible for the various Rh blood types. They have been designated as R1, R2, R0, Rz, r, r′, r″, and ry. Genes represented by small r's are responsible for the Rh-negative (Rh) blood type; those by capital R's, for the Rh-positive (Rh+) blood type.
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ABO blood groups are determined based on a locus on chromosome 93/4the Rh gene is on the first chromosome (1).