Because type O blood is codominant, a woman with type O blood knows that OO is her:​

A) ​DNA
B) ​genome
C) ​phenotype
D) ​genotype

Codominant

In genetics, a condition where two different versions (alleles) of a gene are expressed equally in the phenotype of the organism, neither being recessive to the other.

Type O Blood

Type O blood is one of the four major blood groups, characterized by the absence of A and B antigens on the surface of red blood cells, making it a universal donor for red blood cell transfusions.

Genotype

The genetic makeup of an organism, consisting of the DNA sequences that contribute to the organism's physical and physiological traits.