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4.Principles of Inheritance and Variation
normal
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
$21^{\text {st }}$ chromosome
C
$9^{\text {th }}$ chromosome
D
$7^{\text {th }}$ chromosome
Solution
A set of three alleles present on chromosome number $9$ is responsible for the four blood groups.
Standard 12
Biology
