In one aspect, the invention provides novel tetraploid Brassica plants having no more than two expressible FAD2 coding sequences, capable of producing canola quality oils. Other aspects of the invention provide new variants of the FAD2 enzyme, comprising BjFAD2-b and BjFAD2-a, as well as nucleic acid sequences encoding such peptides. Other aspects of the invention include nucleic acid sequences upstream from the BjFAD2-b or BjFAD2-a ORFs. Other aspects of the invention include transgenic plants and plant pads. Vectors capable of transforming plant cells are provided, comprising the nucleic acids of the invention, including FAD2 coding sequences. Corresponding methods are provided for obtaining the transgenic plants of the invention. Methods are provided for using the plants of the invention, including selected plants and transgenic plants, to obtain plant products. Amplification primers for identifying the FAD2 coding sequences of the invention are provided, together with methods of obtaining plants using the FAD2 coding sequences of the invention as markers.