​Which genotype(s) can produce type O blood?

A) ​AO
B) ​BO
C) ​OO
D) ​AO or OO
E) ​AO, BO, or OO

Genotype

The genetic makeup of an organism, including all of its genes, as distinguished from its physical appearance.

Type O Blood

A blood group in the ABO system characterized by the absence of A and B antigens on red cells, making it a universal donor for red cell transfusion.

Alleles

Different forms of a gene that arise by mutation and are found at the same place on a chromosome, influencing the development of different traits or characteristics in an organism.