Co-dominant markers are preferred in MAS because they:
Codominant markers reveal both alleles at locus simultaneously, displaying two distinct bands in heterozygote versus one band in each homozygote on gel or capillary electropherogram. This dosage information is invaluable in marker-assisted breeding because breeder can identify heterozygous carriers Aa that contain one copy of recessive or dominant donor allele while retaining recurrent background, and distinguish from homozygous donor AA that may exhibit drag penalty or lack recurrent adaptation. In backcrossing, BC progeny segregate 1:1 Aa:aa, and only heterozygous carrier advances, allowing
Ref: Collard BCY & Mackill DJ 2008 Marker-assisted breeding review: co-dominant heterozygote detection. Euphytica
