Q. In man, four phenotypes of blood groups are due to the presence of antigen-A and antigen-B on the RBC. The chromosome that has the gene to control these antigens is
A) X-chromosome
B) $21^{st}$ chromosome
C) $9^{th}$ chromosome
D) $7^{th}$ chromosome
Explanation
A set of three alleles present on chromosome number 9 is responsible for the four blood groups.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.