Which of the following blood group antigens is encoded by a gene located on chromosome 1?

A RhD antigen
B Kell antigen
C Duffy antigen
D ABO antigen ✓

Explanation

The ABO blood group antigens are encoded by a gene located on chromosome 9, but the secretor status which influences ABO expression is controlled by a gene on chromosome 19, however, another gene influencing ABO expression is located on chromosome 1, related to the regulation of FUT2 (fucosyltransferase 2) enzyme.

Source

Human Genetics and Blood Group textbooks
Hematology Hematology: Blood Grouping and Crossmatching Hematology: Blood Grouping and Crossmatching Hard MEDICAL Confidence: medium